Huben K1 .25 2020 Review - Part 1

Links:
www.hubenairgun...
www.hubenairgu...

[@arthurnavarraiii605]

It may not have a "traditional" 11 degree crown but looking at the picture you can see where the rifling ends and that it is in fact perpendicular to the bore. The small unrifled section is wider and will protect the rifling. Thanks for posting, Gregor.

[@henrymoreland8719]

I have been waiting on this for so long, yet I will watch with a heavy heart, maybe some day. please make it a ten part series :-). Thanks Gregor

[@user-hj4md9wu8m]

Huben is power!💪💪💪

[@AirRifleActivities]

As always, very informative, Gregor. I think the velocity was a bit too high for the JSB Exact Kings, hence the deteriorated accuracy, and perhaps - some spiraling down range. But like you said, lowering the power setting of the gun will lead to it operating with no balance between all the variables. The groups with the Exact King Heavies were very, very good at that distance indeed. I am impressed. A lot of accuracy and a lot of power from a semi-auto airgun, shooting a projectile I for one think is a very good one. I can't wait to get my hands on one of these in .25 and blast some varmint with the 34 grain JSB. Thanks for sharing, bud!

[@gregorkamensek3923]

Thanks :) You are probably right. I will take more time to record Part 2 to test best settings for each pellet. This range videos were done in first take, I only sighted in the gun approx. and start recording. The gun has only about 100 pellets through it until now, so I expect better results once I put 500 + pellets through.

[@MT-zl3kl]

Good review as always! My huben .25 has a very different connection of the barrel vs what i have seen on your previous videos, any videos or photos at all. It looks like a very big nut which the barrel goes through and then into the black parts where the magasine is. Waiting eagerly for part 2 to see how this barrel is connected. Keep up the good work! /M

[@rafahr7264]

Buen vídeo gregor A ver cuando podrás hacer un vídeo de la lechi 2 de edgun Sigue asin

[@alexanderneves2665]

Eu tenho uma k1 .25 2019 e uso slugs de 50 grains a 110 joules que são perfeitos para caça.

[@aventura365.]

Excellent thanks very informative like always!!!

[@georgest4194]

Hello Gregor You who have used the huben k1 2020 and the rti prophète performance, is there a difference in their precision and reliability? thank you in advance

[@gregorkamensek3923]

Really hard to compare those two guns as they are in completely different category. if only those two criteria are important to you, then simply because of the semi auto function and the way the gun operates, the Prophet will be slightly more reliable and accurate than the K1.

[@georgest4194]

@@gregorkamensek3923 Thank you for your quick response, in fact I already have a leshiy 2 tichina and I am looking for a more precise pcp at 100m ... It is a pleasure to follow from France, your honest videos

[@gregorkamensek3923]

@@georgest4194 Thanks:) If you already have Leshiy2, then I would in your case get Prophet. L2 is very similar to K1 in principle of operation (basically you already have a semi-auto gun for fun :))... Regarding accuracy, a gun tat shoots out of the magazine can only get same or more likely worse accuracy than the one shooting form the barrel (if both guns are "the same" otherwise). This is simple logic, if the barrel on the gun that shoots out of the barrel is done properly, the one that is shooting form magazine can only come close regarding magazine to barrel alignment in perfect conditions but never quite there... Both K1 and L2 are using this method (shooting out of the magazine) and they both suffer with some accuracy lost (mostly in having flyers - making spirals).

[@milesm1465]

With the details of the slug dimensions it should be relatively simple to work out the minimum twist rate needed for stability with the right software. Don't use the Kolbe calculator though for speeds above 300m/s or less than around 400m/s.

[@gregorkamensek3923]

You are right but as you mentioned yourself, those calculators are for supersonic projectiles where the stability formula is quite different. I have not find any good twist rate calculator that would also work in subsonic region. It is also very much dependent on slug shape. I have already tested some slugs and the only ones that seem to fly straight are flat tail, definitely not boat tails...

[@milesm1465]

@@gregorkamensek3923 The Kolbe calculator is not too bad at speeds below around 250-350m/s compared to a much more complex calculator, it is between 300 and 400m/s that it seems less accurate being based on the McGyro calculator. The McGyro also assumes a solid slug so hollow points will not be correct. IntLift on the JBM site which was derived from some of my very early software first written 40 years ago may give some estimates, but I do not know how good it is at subsonic speeds on some of the current slug shapes. It will only give the aerodynamic coefficients, you would still need to calculate the stability factor separately. One of the problems with boat tail rounds is the reverse flow as the bullet leaves the barrel, this is why some rounds have a rebate at the start of the boat tail. The main point with boat tails though is that they are destabilising and will require more twist compared to a cylindrical base of the same dimensions but they can be made to fly satisfactorily though it will be difficult with air rifle twist rates and solid lead rounds. In the end it is all down to the moments of inertia and the aerodynamic moments both of which require specific calculators which very few people have access to unless they have worked in the field and have developed their own systems.

[@gregorkamensek3923]

@@milesm1465 Yes, I agree with all you have written. I topically use Geoffrey Kolbe calculator, but as you mentioned, these calculations are more an approximation and real world tests might produce different results.

[@KingHaggis]

Thanks for all of your very detailed reviews of the Huben K1. I was looking into buying a LCS SK19 but started leaning towards the K1 later. Now I'm not so sure anymore. I think it's a real bummer that the K1 doesn't like slugs. Is there really no slug at all that will shoot accurately from the latest version K1 Huben? If not then I have to look into Edgun but I would prefer the Huben. -EDIT: just saw your follow up review and it looks like the K1 likes some slugs after all. But now I'm worried about the slugs moving around in the magazine when putting the gun in certain angles like you said in that video. Oh well...

[@gregorkamensek3923]

It likes slugs quite well as I have shown in my latest K1 video. They just must not be boat tail design. I likes JSB knockout and probably others as well I just did not have a chance to test any other yet... I am also wokring on a mold for hollow point slug for it.

[@johnswensonTheAirgunGuy]

Would love to hear your opinion on pushing the projectiles forward in the magazine or leaving them flush as they are loaded. some think pushed forward causes issues... but the larger projectiles fill the whole magazine and work fine. I find better accuracy when they are pushed forward.

[@gregorkamensek3923]

Yes, that is definitely the case. I was actually thinking of a mechanism that would actually push them in the barrel but it is very complex and I abandoned the idea.

[@MSH.M]

please if you can explain how to tune the Reg. up or down. Or if you already have explained it please provide me the link. Thanks,.

[@rubenadrian3067]

Hi gregor I have bought the MP Mold for the Huben K1 version 2020 6.35 I have not tested it yet, but I hope that you will soon upload a video testing this slug on the K1. with Jsb pellets everything works great with jsb slugs being too small. I have been told that the slugs that do work are those of FX slug. One question, which lead alloy do you recommend for MP molds? At the moment I have bought pure lead if you tell me which alloy works best for you? Thank you very much for your videos and the professional work that you always present to us.

[@gregorkamensek3923]

Unfortunately as said in the video, the MP mold for .25 6,35 is not appropriate for 2020 version of K1. The twist rate is too slow. You can use any alloy your gun likes. Generally, airguns prefer closer to pure lead but huben prefers harder alloys. I usually use 1/10 ratio of lead / linotype. But again, i do not recommend shooting MP mold 6,35 slugs in K1 2020 version.

[@rubenadrian3067]

@@gregorkamensek3923 Hi gregor In your opinion, why is it not recommended? What is wrong? I am the owner of a high precision workshop and I can modify the mold or make a new one and I bought MP's because the price is very cheap and I was curious to see how it was made. I am very interested in knowing what you improve or how to improve the slug. Thank you very much

[@gregorkamensek3923]

@@rubenadrian3067 The thing is that Huben has switched to different barrel that is designed to pellets and has twist rate way too slow to slugs. I don't think any slugs will work very well in this barrel... I am already testing some other slugs but I t might be that none of them will work well in this barrel.

[@rubenadrian3067]

@@gregorkamensek3923 Hello again So we only have two solutions: change the barrel to hexagonal or make the slugs lighter as FX has done, removing weight in front and behind so that they do not weigh so much, sacrificing mass is not the best solution for those who want power. What do you think about it? Do you see it viable to pass hexagonal Thank you very much

[@gregorkamensek3923]

@@rubenadrian3067 I changed the barrel for LW poly but still did not get very good results. They were better than with the standard LW barrel but still not very good. Using this barrel, there will still be a lot of challenges. To have a slug that require less twist, these parameters are important: weight to length proportions should be high; mass distribution should be as close to the outer diameter as possible; shape should be appropriate to achieve flaring stabilization. There is still an issue of the slug transit form magazine to the barrel that cannot not be 100% solved. For this purpose, it is better to have slightly harder alloy, not pure lead. I already tested some slugs with standard slug shape (like for example NSA or JSB knock outs). They are not under-stabilized but they have slight spiral to their travel. This means that the problem is in the transition form magazine to the barrel... Also, dimensions of these slugs is usually too small for K1...

[@-Ricochet-]

Very nice and informative review as always! I have 2 questions. Any thoughts about those fliers that ruin otherwise quite nice groups? Can they be eliminated by sorting pellets or fine tuning the gun? And in your opinion, which performs best overall between those 34 graiers?

[@gregorkamensek3923]

Generally, I don't think pellet sorting is needed for K1. when I recorded this video, this K1 was not yet broken in and it performs even better now. I also set the pressure and power approximately by my experiences, I did not spend a lot of time playing with in... Generally I think that this is about what anyone who gets the gun will be able to accomplish, those who will put more effort in will be able to get even better results. Some amount of uncertainty (flyers) will always remain with K1 as it shoots from the magazine. JSB King Heavy and King Havey MK2 both perfom very well, MK2 require slightly lower speeds but can be in some cases more accurate (not by much)...

[@-Ricochet-]

@@gregorkamensek3923 Thanks for the nice explanation. Any plans for showing the current / optimal accuracy with pellets? Preferebly at 100M? Would be cool if it could, as you said, reach a 1.5 or 2 MOA accuracy. There are several reviews of the new K1 out there but most seem to focus on the fun or hunting aspect.

[@nightshade4186]

Thanks for your informative videos. I have a question about mounting a belt, there is a hole behind the speed regulator wheel, can this hole be used for a belt mount screw or does this have to stay open?

[@gregorkamensek3923]

Yes, that gun stock has two holes predrilled. One on the front (I use it for bipod) and one at the back, behind the power wheel. You can use those holes for any accessory you want including putting a screw in that will be used for a belt. I would advise you to measure the depth of the hole and use a screw that length or maybe a bit shorter...

[@nightshade4186]

@@gregorkamensek3923 Yes I also use the front one with a rail and bipod but walso want to add a belt. Simply put a belt mount on the scope rail. Good to know that the hole behind is power is meant for that. Thanks for your valuable advice.

[@gregorkamensek3923]

@@nightshade4186 👍

[@eaglekind]

What’s the most accurate slug/ pellet in the k1 25 cal….. I just bought one from New England airguns

[@gregorkamensek3923]

Hi. My K1 .25 is 2020 so it is not the newest. I would suggest you test the ZAN projectiles .253 slugs and also try Altaros slugs (but not Kings as those do not fit in the magazine).

[@redgum1340]

Hello Gregor, does the barrel have a small chamfer as a soft lead-in for the pellet entering the barrel?

[@gregorkamensek3923]

It has a slow and small forcing cone. It actually looks similar as muzzle crown.

[@vinceywinceyspider]

Hi could you tell me if a manufactured in march 2022 k1 is a mk3

[@gregorkamensek3923]

I think everyone including Huben have lost mk"x" count... So it depends what do you mean by that and why you want to know this in the first place (any particular feature)?

[@harz982]

I should have watched this video earlier. I saw your older video where you said you get much better results with 5.55 slugs from mp-molds. Therefore i ordered the mold and got it just today :D Now my question: when i order the replacement barrel from your store and put it in my huben k1 2020 cal .22 will i be able to use the slugs from my mp mold? Thanks in advance and greetings :)

[@gregorkamensek3923]

Don't worry, you probably did not noticed that I was reviewing only .25 cal version in this video, and only .25 version will not work well with MP molds slugs because they have slower twist rate in 2020 version. I have not tested the 2020 version of .22 caliber yet (they are not available in Europe yet), but judging by the info I have about the twist rate, the MP mold 5.55 should work well in them. I will of course have a video as soon as I have it...

[@harz982]

@@gregorkamensek3923 great news! Thank you!

[@michup86]

Hey Gregory. How about MK2 in .22. will it shoot JSB knockouts - they are produced in this caliber too.

[@gregorkamensek3923]

I intend to test them as well along with other new version of slugs.

[@aerialshootwonderboy919]

hello greg how r u? hope u doin ok. its been long time never touch with u. anyway i just want to tell u that i allready got my huben k1 2019. currently im using jsb jumbo heavy .. im looking forward go for longrange shooting. what pressure should i set up in regulator? and for longrange shooting how about the power wheel adjustment? high air or low air? is it necesary to adjust in high air to push the pellet harder?

[@gregorkamensek3923]

Hi. I will have a video out in a day or two that will answer all the questions you asked...

[@miguelarbona1752]

Hi Gregor Good review. Can you confirm if the barrel is a .254cal ratio twist 1.22 Thanks

[@gregorkamensek3923]

I am not exactly sure of its dimensions, but according to my measurements, the twist was about 1:28"... Huben any confirmed to me after I recorder the video that the barrel is made specially according to their specifications. They also said that it is made in China.

[@miguelarbona1752]

@@gregorkamensek3923 There's a Spanish manufacturer that also assembles barrels made in China and doesn't want to reveal the brand and the details of the barrel either.

[@archiequinez]

Hi Gregor, I know this video is specifically about the .25 version but do you think same applies to the .22 in terms of pellet stability for 2020 release

[@gregorkamensek3923]

I will be able to let you know once I get it

[@mikecolz7867]

Gregor. Really enjoy the channel. Any update from RTI on the slug barrels/liners?

[@gregorkamensek3923]

Thanks :). No news about the RTI slug barrels yet :(

[@mikecolz7867]

@@gregorkamensek3923 Thanks. Rti, or fx for long distance? In your opinion which do you think is the better rifle. Thanks again. Mike

[@gregorkamensek3923]

@@mikecolz7867I cannot say as I do not have experiences with FX. RTI Priest is excellent for long range in my opinion with pellets but I am sure FX is very good just as well. Not sure how FX handles this, but the really big advantage of RTI with long range barrel is that you can push pellets at velocities that woudl just make them spiral in other airguns...

[@mikecolz7867]

@@gregorkamensek3923 I am excited for the slug barrel. Do you think that will be accurate at 200 yards in 22/25/30?

[@gregorkamensek3923]

​@@mikecolz7867 I certainly hope so. What would be the point if it wasn't...

[@empedrai]

Thank You Gregor, i Like to watch your Videos. Great Work, informative and nice presentation. I can hardly wait for the next parts... :) I am situated Not so far away from Slovenia and i have the Huben k1 in .22 - maybe WE can get in Touch AS i have some questions. How can You be contacted?

[@gregorkamensek3923]

You can give my your WhatsApp number or send me you email.

[@TTMEable]

does anyone know what a gen 7 is? i purchased one from airguns 4 patriots and they called it a gen 7

[@tonyhenry7089]

Gregor have you tried a fx 25 cal slug barrel in that gun

[@gregorkamensek3923]

This is quite a frequent question I get regardelss of the caliber (.22 and .25). The answer is NO. And there is a good reason: it has to do with bore diameter. The FX barrels are tighter and K1 shoots out of the magazine so it would probably not produce good results. I might try it sometina anyway, but I am quite confident I will not get any exceptional good results.

[@LionHGH]

Would this be good for home defense?

[@gregorkamensek3923]

I do not live in a country where this would be acceptable, so I cannot say...

[@tuomaskeltanen]

@@gregorkamensek3923 Or, another question: if wild boar attacks you when hunting, will this take it down?

[@Sc0ooter]

Is it possible to install FX barrel on the huben? A kit or something to install liners in huben.

[@gregorkamensek3923]

FX barrel would not be approprirate for K1 beacuse of its bore diameters... So you would probably not gain on accuracy. Besides, 2020 .25 K1 shoots very well with pellets so there is no need to make any mods (unless your idea is to use slugs).

[@Sc0ooter]

@@gregorkamensek3923 my idea is to install FX barrel, and change liners when needed. Beside the new superior shoot both pellets and slugs very very well. Huben k1 with stx would be amazing.

[@gregorkamensek3923]

​@@Sc0ooter Well, I am certainly eager to know the results if anyone will try to do so, but the main issue will be shooting out of the magazine, so it might not give good results.

[@stedyone1090]

I preordered a 2020 Huben K1 in 22. Can I shoot slugs at high speed with accuracy?? 1050fps or more??

[@gregorkamensek3923]

I don't know yet what specs will the .22 have, but I should get one and I will make a video as soon as I have it.

[@stedyone1090]

@@gregorkamensek3923 Thank you. Very interested to know.

[@user-hj4md9wu8m]

Gregor hello, please tell me what size the spring and metal ball that hold the filler port cover?

[@gregorkamensek3923]

I think it is 2.5 mm ball

[@gregorkamensek3923]

Sorry, it is 3mm

[@user-hj4md9wu8m]

the size of the spring then what? or where can you find out how long the spring is there? I lost mine

[@gregorkamensek3923]

@@user-hj4md9wu8m Spring is about 5 mm long when extended. Diameter is 3 mm of course, same as the ball

[@user-hj4md9wu8m]

@@gregorkamensek3923 thank you very much Gregor. I wonder if there is one spring or two?

[@markpoepiloeri8511]

Hi gregor i have a question. My huben k1 version 2 shoots very well with huben solids .22. But due to not available any more is was checking around for some other slugs. I believe my k1 is set around 100j at 160bar reg pressure. I tried h&n hp slug but it was all over the place. I now have new ones to try lbc heavy 36grain boattail slug. I noticed that the huben slugs have some resistence in the huben. But both lbc and h&n go quite easy in there. It is 5,52 by the way. Should be the same as huben slugs. Could it be that i shoot with a wrong setting? I hope you can help me out. Testrange was 100meters thanks in advance

[@gregorkamensek3923]

In my tests, huben solids were the best and I could not find a good replacement mainly because slugs for huben should not be 5,52 but rather closer to 5,62 mm. This is one of the reasons why I designed the mold for K1. It is still availabe from MP molds in you are willing to cast your own slugs: www.mp-molds.com/product/552-mm-air-rifle-pellet-8-cav-mold/

[@gregorkamensek3923]

You should defintely still try to play with pressure and power to try to get good results but I doubt you will get them with slug of this size.

[@markpoepiloeri8511]

@@gregorkamensek3923 thanks gregor i consider your mold

[@markpoepiloeri8511]

@@gregorkamensek3923 hi gregor i bought the 5,55mold for my huben is that ok you think? I am looking forward to cast

[@gregorkamensek3923]

@@markpoepiloeri8511 No.

[@TheScrapyDog]

👍👍

[@danhenry8557]

It would be awesome if it shot 38 or 44 grain slugs

[@gregorkamensek3923]

I don't think this barrel will handle those. The twist is too slow.

[@5Komma5]

This video needs age verification. YT sucks

[@bubbleone6526]

Bro it’s Chinese! Please go back to Air Arm RTI. I bought my priest because of your videos. I’ll still your videos but very disappointed.