Eliminate Cold Bore For Pennies: Part Two

[@sawhill729]

Hope you keep up your career in the reserves. I had a bad commander in my third enlistment and walked away. The pension and tri-care are worth it. Thanks for your service brother.

[@ryanscholl5450]

I’d have stayed until they made me leave until I had a garbage commander. Bad commander can make a 1SG’s life a living hell and I never wanted to chance that again. Retirement is official next month.

[@davidmcneil1550]

Love these deep dives into all the variables with rimfire ballistics. Love that you are keeping an open mind and being really curious.

[@Truckboy383]

Thanks a lot for your service and the content sir. This has opened up the minds of many.

[@PursuitofAccuracy]

Thanks brother

[@idahoron]

Great video. Blow tubes have been used for decades in muzzleloaders. For sharps rifles, they have blown down the barrels since the late 1800's.

[@RetiredFE]

Excellent video Josh. Thanks for your service. I too retired from the Air Force Reserves after 30 years. The Tri Care benefits and pay are well worth it. Looking forward to my next range day. I have a CZ457 MTR that shoots very well but the cold bore shot is killing me. Can't wait to see if it works for me. Thanks.

[@FishOn1]

I tried this by plugging the barrel with a (clean) ear foamy and an ECI on my CZ PV. I can say it certainly seemed to work. Will test it on my CZ MTR next time I have it out using the straw method.

[@johnstewart2011]

It is so refreshing to see tests like this that are comprehensive and conducted carefully enough to produce meaningful results. I’ve long wondered about the cold bore shift question, and although I’ve about decided that it’s not something I experience with centerfire rifles, there are too many reports about it from 22 rimfire shooters to ignore. So, it’s great that someone has actually looked into the possible reasons and cure. Thank you. And yes: Stick with it. The Army needs all the good people it can get.

[@chrislang5659]

Went out today with the Rem.597 today. I forgot about the advice given in the previous video. Sure enough, first shot after cooling was a 3" flyer. After that it all came together and we got an 1 1/2" goup at 100 yards. Gonna learn to use the straw technique and will probably use it in a video soon. I have suggested the technique to other channels with your channel name!❤❤❤

[@PursuitofAccuracy]

Thanks brother

[@mlone7]

You have to approach everything with an open mind even if dozens of others have tested the theory, you have to test it because you dont know everything they did or didnt do in their tests. I have found that people see things and think things differently. Doesnt make them right or wrong, just a different approach. Many times someone will say or do something that triggers something in you that you piggyback off of that idea and incorporate it into your ideas to come up with a solution. A prime example of that is my comment on your TX22 short video about the fix for feeding problems to where they shoot any and all ammo. I for sure am going to try this my next time out. Cold bore shift sucks.

[@justinmcbee8881]

Great follow up with different ammo and VERY similar results.

[@raquaro1]

I have arrived at the same conclusion that rimfire is anything but consistent. So many variables. The ambient temperature difference between your Eley testing and this one probably made a difference too. But the mind blowing part of both part one and part two is the straw! Who would have thought? I have regretted not staying in the reserves after my RA enlistment many moons ago. But other things got in the road and I didn't. Glad you are doing it. Thanks for your service and good decision.

[@paulvincent6151]

Great video Josh very interesting.

[@rickmoore6527]

Josh. I so appreciate your content. To refer to these offerings as merely videos would do them a great disservice. You are indeed transparent, thorough, genuine and professional in your testing and in your KZbin product. I can think of no other creator in this space that is equally informative, concise and thought provoking as you. Thank you for sharing your vast experience with the community. Now- Go have a cookie, you earned it!

[@PursuitofAccuracy]

Thanks brother

[@davepoidvin2364]

Josh you are the man. Great vdeo, always interesting. All the best and thank you. Dave & The Girls

[@PursuitofAccuracy]

Thanks Dave, hope your all doing well and shooting straight

[@brentsmith4688]

now I need to add a straw to my range bag. great video, thanks

[@davidhandyman7571]

The benchrest competitions is shoot in have sighter targets and therefore, cold bore shift is taken care of by putting one round into the sighter and then checking POI. I have been using SK Rifle Match and there seems to be little cold bore shift and my rifle likes it. The only problem is it is hard to find here in Australia.

[@michaelbutler4961]

Thanks for sharing Josh. I have a couple things to bring up. I believe the rifle you were shooting in this video had a custom barrel and your gunsmith would have checked for tight spots in the barrel, so in your case, I think it has more to do with what you were addressing in your 1st video causing the increase in FPS on the 1st shot. If a barrel has not been checked for tight spots it would be a good spot to start.

[@realtruth4259]

U r approaching #GOAT STATUS FOR UR HONESTY AND INFORMATIVE VIDEOS!!!! U R THE BEST 22LR KZbinR PERIOD..... JUST THINKING BOUT THE GUNSMITHS NOT BEING ABLE TO SELL EXPENSIVE PRODUCTS IF A STRAW WORKS.... I EXPECT KENNY'S TO CHIME IN SOON..... TNX FOR THE VIDEO

[@rosalindstewart7013]

Great stuff mate, thanks for the info and the time and effort you put into making these vids, much appreciated, cheers Yogi ✌️🇦🇺

[@johngeorgopoulos2568]

Thanks Josh!

[@SoFloPrecision]

Just finished shooting and tested the straw method. Definitely seemed to help the first round POI shift in my BMR and Eley SABR Precision. 👍🏼

[@SharpShooterCO]

Nice work Josh. We appreciate you taking the time and further exploring the POI shift dilemma. I will certainly test this on my own and report as soon as I have definitive results. Thanks again 👍

[@roseybut]

Hello from here in the UK. After the first video I tried it and well "Dang it" I got the same results as you. Thanks for sharing.

[@BenchrestMarksman]

Thanks for sharing Josh

[@fieldpro5041]

thanks for taking the time and ammo showing your tests my friend

[@Precisionriflesireland]

That is a great bit of information Thanks for sharing. I will have to see how it goes in my rifle 🇮🇪💪🍀

[@nameynamerton5833]

Please do a test with a center-fire rifle that has a demonstrable cold-bore flyer.

[@Pje3ski]

Very interesting information. Thank you for sharing.

[@PursuitofAccuracy]

Thanks for watching

[@kencurtis508]

Great video, thanks for sharing.

[@lutherprice2062]

Good content Josh, since I started shooting a RimX with Lapua/SK ammo I haven’t noticed the cold bore shift as much but when I was shooting the Bergara B14r I noticed more cold bore shifts using Ely and Geco which both have the waxy lubricant especially in colder weather. Thanks for the video, more variables 😂

[@austinkroe]

Have you tried out the Hoz and Shield Cold Bore Cap? Seems like a nice durable alternative to the finger condoms. I know you say you were done with the series but it would be cool to see you shoot groups for cold bore shift with all of your precision 22s. If you start with one gun the 30 minute wait might be up by the time you shoot a group with your last one. Also, interested if you’ve noticed a POA to POI shift in any of your guns when shooting off a bipod compared to off props or with varying amounts of shoulder pressure.

[@PursuitofAccuracy]

@@austinkroe that sounds expensive to test lol. Some stocks and chassis will have a poi shift from bipod to bag on prop that I've noticed. Haven't noticed any poi shift with different shoulder pressure.

[@austinkroe]

@@PursuitofAccuracy nope, not a cheap test at all. With the POI shift, I tested it with my gun at 135 yards and didn’t notice a difference either. But what got me thinking about it was Tyler Orth’s interview with Jason Nedved a bit over a week ago. He mentioned it and I was wondering if I was nuts for not seeing a shift.

[@donniepowell7146]

You nailed it! Definitely works.

[@careyemory7757]

Josh what we have been doing between firing is leaving the empty spent case in. I know you can’t do this in prs matches but on bench rest matches we have I don’t know if it works are thought is it keeps the moisture out. Might be blowing smoke?????

[@ccwilder3]

Great vid. Very helpful.

[@colingregory7464]

It looks to me like there could be a low velocity on the second shot, but while it does seem to have happened multiple times it may be my imagination, but it would be interesting to see if it was statistically significant (as well as the degree of speed change with different ammo ?)

[@PursuitofAccuracy]

I see a slight drop on the 2nd depending on which ammo etc but its usually 10 fps so within the acceptable ES.

[@BigTimberLodge]

I think you're really onto something with this. Look forward to talking about it with you tonight on the podcast.

[@PursuitofAccuracy]

Yes sir, see you in a bit

[@ericrumpel3105]

Thanks fer sharing, Always enjoy your interesting videos full of info.

[@ShooterB1]

I have heard benchrest guys push a patch or 2 with lock-ease graphite lube to help lube barrels. If it helps the poi shift or cold bore, I don't know.

[@PursuitofAccuracy]

Makes sense

[@22LimaRomeo]

Nice work!

[@jessestarkey4024]

Great video as always man! I can't wait to see someone at a match blowing in their barrel 😂 Awesome info though!

[@PursuitofAccuracy]

Lol thanks

[@drummer0864]

If this works out and more and more people start blowing in the barrel, pretty soon they will start putting nipples right on top of the receiver, so you'll have a place to attach a hose.

[@No1JetDoc]

Sweet! Thanks!

[@miketokar9010]

Good stuff Josh … I would still like to see your bedding jobs and technique on your CZ rifles. Like free floating the barrel . Getting rid of the barrel pad in the manners stock

[@PursuitofAccuracy]

I dont have a manners anymore. I do have the b14r bedded in the woox furiosa

[@garylozowski1419]

A 18” length of clear vinyl tubing is easier to maneuver to bore

[@theheck123]

wow that's pretty convincing evidence. i've always heard the carbon ring in the chamber was the major factor, so that's not the case anymore? my stock CZ MTR has a horrendous cold bore shift. how would you suggest using the straw method at match, since you have to remove the chamber flag to do it.

[@PursuitofAccuracy]

At a match id just plug the barrel like we did in the 1st video. Or you could just blow in the chamber during your make ready

[@audieladd2476]

Hey Josh, any plans to get a Victrix 22lr? Fellow KZbinr "X Ring" did a recent video where he was shooting 0.1's straight out of the box. He said Vudoos and Rim X's just can't compete and the Victrix has no feeding issues which is a huge bonus.

[@PursuitofAccuracy]

Id love to get my hands on one. They are very expensive. It would be cool to see how they compare in an outdoor shooting environment though

[@audieladd2476]

Well start saving then Josh, we look up to you to get the gear 😁@@PursuitofAccuracy

[@PursuitofAccuracy]

@@audieladd2476 lets hope they are still in business in 2026 when ive scrounged up enough 🤣🤣

[@audieladd2476]

I look forward to that with great anticipation 👍 Mr X Ring said they're better than Vudoo and Rim X, but did you notice he didn't say the same about Anschutz? That's because he couldn't. The A in Anschutz stands for A+. It all starts and finishes with Anschutz. @@PursuitofAccuracy

[@XRING]

It’s in the works on the Victrix. I’m hoping to get my hands on one soon! Also, I believe that the testing that Josh is doing with the straw has total merit very similar to much of the suppressor testing I’ve done with regards to first round pop. The first shot is always louder because of the oxygen within the suppressor itself ,all subsequent shots are normalized and are much quieter because the displacement of oxygen.

[@BillRogers-jh8pp]

Just watched, with great interest, both videos on this. And subscribed! A question remains that you barely touched on. I can certainly see a vertical POI shift due to a change in MV, but I frequently have a left / right deviation that accompanies the vertical. Can you offer any ideas on that?

[@PursuitofAccuracy]

Its more than likely just harmonics causing the left to right shift. The higher mv shot being out of the node.

[@BillRogers-jh8pp]

​@@PursuitofAccuracy Seems that's the default "cause", though I'm not so sure I believe a +30-40 MV difference incites a 1/4 to 1/2MOA horizontal deviation from s bull barrel. I'm not arguing your explanation, I just don't understand how that can be, and I'd like to. Re: Relative Humidity at differing temperatures - Absolute Humidity will more accurately indicate bore moisture. RH will better predict evaporation ('cold bore') wait time. The straw negates both!! Appreciate your videos - you think and wonder and question AND test - a pretty good combination! '

[@timbcf]

Hi Josh, just wondering what is your average cold bore shift. I am averaging .1 and after 150 200 rounds my cold bore is .2mil. Not sure about the other tight spots theory as there isnt enough time for the metal to take the heat, i think of annealing brass flame time along with that.

[@PursuitofAccuracy]

Typically .2 for me

[@djalluget6870]

Good information and not even going to mention you blowing the rifle.

[@PursuitofAccuracy]

Lol yeah kind of left the door wide open there

[@scottluther6699]

Nice but one comment, at 46°, the humidity in the barrel might not be evaporating near as quickly as at 60°. But overall very interesting test. Would have been fun to see the poi shift before and after, especially at 100 yards. Always like your content. (Ha! Even gave you a Grundy vote 😊)

[@PursuitofAccuracy]

Haha appreciate ya!

[@Lowballinoutdoorz]

This is awesome!!

[@drummer0864]

I have a point of impact question that is not just relative to the first shot. I watched your vids. and Day at the range vids. and I am wondering why is there a POI., shift target to target? Nobody seems to address this phenomena. Either it's point of aim or there is something else going on. One group is at 11 o'clock and the next group will have a flier at 11 and the rest of the group is at 2 o'clock, or something to that effect. I, neither have the skill or the equipment to under-take such a study, but I figure that since the 22, is one of the longest and most produced rounds in the world, someone would have looked into this by now. I'm guessing most of the time, while shooting groups, people don't adjust the scope to hit the center dot because they want that consistent aiming point, but I would think that on a challenge target, with one shot per target, that would be ideal. I'm I right or wrong on this? I thank you for your videos and the knowledge I'm gaining watching them. I am planning to get into bench rest, or something in the near future so I'm trying to soak up as much as I can.

[@PursuitofAccuracy]

Poi shift can be from something as simple as wind direction etc. Production rifles are much more prone to this as well. Custom smith'd rifles will have the actions trued eliminating any shift due to expansion as the rifle heats up

[@MuneebKhan-zv1bb]

I still believe it's the amount of oxygen that causes higher velocity of first shot. By blowing through straw the air is replaced with moisture and Carbon Dioxide and both are non combustion materials and keep the velocities in tight figures. Some lubricants also burn and might help in increasing the velocity by few feet per second and that can be checked by rubbing the tips with alcohol patches and get the velocities compared with the lubricated ones 😅

[@Lunch_Peak]

I am not sure about this take. Because when you exhale most of the oxygen that you breathed in is exhaled, you only use a small amount of the oxygen in each breath when your not doing vigorous work. Additionally having more or less oxygen in the barrel shouldn't effect the combustion very much as the gunpowder is self oxidizing and the oxygen in the barrel is separated from the combustion at all times by the projectile. As for the lubricant burning, that could be an interesting thing to test.

[@edchesnut7309]

Oxygen in the barrel is on the wrong side of the bullet to have any effect on powder combustion.

[@nathanphipps256]

You mention that it’s moisture buildup inside the barrel but blowing with a straw removes it I would think that would add more moisture from your warm mouth and lungs I would lean more towards the oxygen amount like a mono core suppressor has a 1st round pop after the first shot it’s quite.

[@PursuitofAccuracy]

I actually meant your adding moisture with the straw. I believe the mv jump is due to airflow removing the moisture

[@nathanphipps256]

Ok makes more sense that way

[@johnkissam8312]

Is “cold bore shift” unique to .22 or common across calibers? Would think this is something the military has studied. Something the artillery has looked into. Is it something that must be accounted for. (Would need one damn big straw)

[@davidhandyman7571]

Military shooting does not require "accurate shooting" as competition does. The military usually has wider tolerances for acceptance. While you or I might require half MOA or better, I believe, military accept 3 MOA. Therefore, cold bore shift is not something to concern them.

[@BROTUNED]

Great video Josh

[@johnmarston7563]

Wouldn't a pass through with a dry patch accomplish the same thing?

[@PursuitofAccuracy]

No, it would only create a more dry bore

[@dazdragon445]

Great work

[@bryant2183]

Would a can of compressed air work or is it the warm breath warming the lube in the barrel?

[@PursuitofAccuracy]

I think its the moisture of your warm breath

[@tylerorth2870]

You can be my barrel blower any day Josh! Thanks for the content!

[@PursuitofAccuracy]

Haha, will blow in barrels for ammo

[@jameshwang4750]

Do you think this is also true for center-fire rounds?

[@PursuitofAccuracy]

I dont think they are affected the same

[@bellasignora2668]

Hi, I have never seen your channel before, so probably already given full rifle specs. I am looking for a new rifle & that looks to be the exact one, I notice the Theos but nothing else, please could you list all geek specs so I can replicate a full clone, especially the ultra low, forward reach (3"?)mount, I have looked without success. Kind regards....

[@PursuitofAccuracy]

The scope mount is no longer offered in that specific model. Vudoo 360 Krieger 24" 1.250 straight barrel Bix n andy tac sport pro Xlr envy pro chassis Gray ops weights

[@bellasignora2668]

@@PursuitofAccuracy Thank you for the info, shame about the mount, the first thing which caught my eye, having to always use one, I wonder if you would know who makes the closest thing, I have looked at Sphur but yours looks lower, is it 3". Thank you again

[@PursuitofAccuracy]

@@bellasignora2668 i believe the spuhr i have is the 4026. Should be able to look up specs on that and match it to a current model

[@jerryking3208]

Thanks. Don’t think that will work for my first shot squirrel hunting, but interesting😁

[@PursuitofAccuracy]

Bring a camo straw 🤣

[@michaell397]

the finger condoms have been sold for muzzles for years. I was given a pack years ago at the Shot Show In O'rleans. Idea was t keep rain, snow and grit out of the muzzle When I was there with Nugent. I'm lost on the straw method if moisture is the issue as blowing down the bore would introduce even more moisture. No? KnifeMaker

[@PursuitofAccuracy]

@@michaell397 moisture is naturally left behind after firing a round, so each shot has moisture helping to lubricate the bore. The problem is the 1st shot after a time that has a dry bore, it's going to create more friction and resistance creating a mv spike

[@SPRINTGTO]

What is the brand, model etc of the Chronograph you are using ? Thanks

[@PursuitofAccuracy]

Fx true ballistics chronograph

[@darrylblosser745]

I've heard of guys coating their ammo with WD-40 to get better results. However, it was not match grade ammo being used. Now I'm curious

[@tjdement8229]

I know you have mentioned it. But what chronograph is that

[@PursuitofAccuracy]

Fx true ballistics

[@vernonarmstrong3738]

I cant wait for my next go at Morgan's Shingle at project appleseed. ;)

[@zenrider16701]

But what did that do to group sizes??

[@PursuitofAccuracy]

Out of that rifle it eliminated my first round from being .2 high. Its not gonna affect group sizes so much as eliminate that 1st round mv jump

[@nrf2009]

Time to start selling the "pursuit of accuracy" cold bore eliminators on your website 😅

[@PursuitofAccuracy]

Lol

[@lewisrice3741]

Hey that is a good idea or you could use one of those trigger flame lighters you know the one you just pull the trigger. Beagleman

[@missedshot9235]

Now the price of straws are going to skyrocket!!!

[@PursuitofAccuracy]

Doubt it lol

[@chrismuncey3861]

I wonder if a swab with a little wax lubricant down the bore would work to 🤔

[@johnsathe2429]

I have to wonder if the same thing happens with other calibers? Say 5.56/.223. I'll have to check and see if it's the same thing. Very interesting.

[@tw1st3dw1ll7]

My theory would be oxygen in the barrel, but a tight spot is another factor that is possible

[@TDub326]

****Competition straw market gears up****

[@PursuitofAccuracy]

Its all just a long play for me, i bought stock in straw manifacturing, now i just sit back and collect 🤣

[@milesshorey4695]

You use 30 minutes but I wonder how quick it actually happens.

[@PursuitofAccuracy]

Would depend a lot on environmentals i suspect

[@tommyrq180]

Bottom line: we should all start calling this “dry bore shift” from now on. 🧐😁

[@sofjanmustopoh7232]

Saving McDonald’s straw for my shoot bag 😄

[@dogbone1358]

So that’s why the beard is missing. 😉

[@PursuitofAccuracy]

Yup

[@ClaytonMacleod]

One inhale, one exhale? Or are you huffin’ on it like a paint fiend?

[@PursuitofAccuracy]

One exhale lol

[@ClaytonMacleod]

@@PursuitofAccuracy Hehe. Alright. I intend to give it a try one day, and didn’t want to exhale once and have it not work, and then waste a bunch of time having to wait so I could try again. Just wanted to make sure it was once or twice, whatever the case may be. Thanks. ;) We were actually joking around at this morning’s benchrest shoot. “Anybody got a straw I can borrow?” “Don’t you mean a tactical straw?”

[@joelclark2130]

Preheat You're barrel with a bic lighter

[@anthonybending2687]

WTF, amazing,

[@brendonbenson]

Great work josh i know my rifle has a cold and clean jump in mv but never tested in this manner will definitely be checking could be i only sk lrm and r50 iv not noticed 🫣