Subsonic suppressed 308 - Part 1

Working up a subsonic load for the bush pig to shoot over Ninja. This series will cover the development, testing and terminal ballistics of the load.

[@operator1192]

Aw man that popcorn analogy is probably the best and most original way I’ve ever hear someone describe the density of Trail Boss compared to almost all other powders.

[@OBWAdventures]

This series is fascinating

[@TheArmedTramperNZ]

I need to make a few more - and I intend to this spring

[@michaelhorton4250]

Hi Nathan. I'm using the Winchester subsonic factory loads in my Tikka T3 and they are firing clean, I've sighted at 50m and am grouping in 1inch. Are you shooting further than 50m? Do you know what your drop at 100m is?

[@xkguy]

Berry sells a 220gr copper plated bullet ($85US for 200). With 10.5 gr Trail Boss was my best subsonic .308.

[@Riqrob]

I finally got my supressor. But I've been warned about using lead bullets through my supressor. Had any problem?

[@TheArmedTramperNZ]

None at all 👌

[@tiroesportivo]

What velocity?

[@tiroesportivo]

@@TheArmedTramperNZ 308 with 1079 fps?

[@cococharliematenga4829]

Wow, look forward to the soft target results, well worth the effort there.

[@thomasgrant5232]

That was honestly such a sick video!!! Keep up the great work!

[@johanlabuschagne377]

Awesome seeing a Kiwi doing vids like this. Keep up the good work.

[@TheArmedTramperNZ]

Thanks mate!

[@robinhorne4896]

Hi. Not sure if you'll get this. I've watched all your video's . I have a bergara takedown and want to load sub sonic rounds. I have 220gr hornady sub x . What would your suggestions be? I have primers ,still trying to source trailboss powder. Hope to hear from you. Regards Robin

[@TheArmedTramperNZ]

Are you in NZ?

[@reuben.jane01]

Look foward to seeing how they perform on animals. Cool vid

[@johnmills837]

8.3gr. of Redot mate.

[@jozefhorvat3625]

Wooa... Man with brains... One of it's kind... Using very reliable budget rifle with internal hammer 👏👏👏👌👌👌👍👍👍 Scum with external hammer is for brainless creatures !!! Excellent video mate. LIKE 👍👍👍

[@TheArmedTramperNZ]

Thanks for your support

[@OHINERATA]

Great vid mate be good to see what it dose on a animal

[@tedbear2478]

My projectiles expand to roughly 15-16mm but still it does not drop them deer always straight away. Mine are only about 180grains and hollowpoints.

[@TheArmedTramperNZ]

Yeah I’m finding shot placement is critical

[@tedbear2478]

@@TheArmedTramperNZ well i cast my bullets verry soft they expand prety nice. Does not matter where I hit them. My bullets are so soft you can pinch em with your fingernail and leave a visible indent. But its hard to get then to shoot well when they are so soft. Need slow powders for keeping pressures low. Next attempt i will mak bullets with a softer nose and harder shank.

[@greatdane3343]

Great video mate. Amazed you're stabilizing that weight with that twist rate... but good for you. My 1:8" CVA Scout wont stabilize over 200gn.

[@Riqrob]

I've read in several places that the blunt nose of the lead bullets help to stabilize. Less length for the weight.

[@jozefhorvat3625]

​@@Riqrob👍👍👍

[@williammitchell1864]

The Armed Tramper, Use not just subsonic bullets but put petroleum jelly in the sound suppressor and hear the difference. About the only thing that you'll hear is the snap of the firing pin snapping forward.

[@pepperoni-prepper]

speed of sound changed depending on altitude etc. my 308 takes about 9gr trail boss for ideal velocity of about 1050fps with a 150gr cast projectile. i tend to favor increasing the weight of the projectile, over reducing the powder charge. I have now gone up to a 200gr cast projectiles, since i have a 1/10 twist and yet to tune the powder. i have heard a lot of people talk about projectiles stopping in the barrel, however, yet to see it in real life when you are driving the projectiles at 700-1050fps.

[@Getsen42]

A full 10 MOA drop at only 50 yds Something has to be in front of you 10 yds away to try hitting it

[@TheArmedTramperNZ]

Not sure what you’re on about chap. First of all, that’s 50 metres. Secondly the group is INSIDE 3 MOA. That was the goal 1 1/2 inches or smaller at 50m - that’s head shots all day.

[@Getsen42]

can’t get close enough to the wild pigs and bucks on my ranch with sub sonic 308…..they are worthless to me, however, 308 147gr hot loads…no problem shooting 0.0125 groups at 200yds zeroing

[@1philliph]

I use 11g Trail Boss under a 220 or 225 g Hornady projectile. Not sure of velocity but would be around 1000ft/sec give or take. I zero my rifle with supersonic 180g rounds at 100m then use the ballistic reticle to hold over for 100m targets subsonic. 1MOA is doable sometimes 4 shots out of 5. Big projectiles need a 1;10 twist or faster. If you use the 2.8 inch max length for the overall cartridge and a 225 Match projectile then 11 grains is getting very close to the max non compressed capacity of the 308 brass. Word is dont compress the Trail Boss Powder as very bad things can happen. My next task is to track down a good 220g projectile that will mushroom on deer because match stuff and probably sst or other ballistic tip stuff wont.

[@marcusfellerhoff]

Are you still using the cast projectiles or moved onto something else. Im looking at doing this as well to shoot over my dog which is a bit gun shy

[@glennilsson8850]

great video's, shame suppressors are banned in australia, great set up.

[@glennilsson8850]

lololol, got it in one mate, keep the videos coming, great to see a hunt dog used properly in great country, good luck, thanks mate.

[@gregmcb5305]

I would keep it under the Transonic barrier like 950fps or less that’s for accuracy and sound. with the right twist rate you’ll be set

[@tahamert8494]

Hi brother what s your caliber and supresor brand.

[@TheArmedTramperNZ]

Dude, watch the video. Both questions answered in the first minute 🤣

[@Andomaca1]

Interesting project

[@bartoszbaranowski604]

Nice.

[@jesseterrill5413]

wat wud b th twist rate of tht rifle?

[@jesseterrill5413]

@@TheArmedTramperNZ sweet as thanks iv got th plastic version nd i keen to reload it any recommendations on wat to put through it?

[@poodlenz]

I thought the 308 were 1:9.5? I am really surprised that enormous bullet stabilises.

[@until11]

Did you do any research into what the best barrel twist rate for this would be? What did you end up using?

[@khaybarr9716]

what length of silencer do you use?

[@hankbraff1135]

Good on you Nathan will be interesting to see how they perform on some animals.

[@АлександрЛыхин-в2ц]

Russian gun?

[@TheArmedTramperNZ]

Yep, Baikal 308

[@AAkCN1]

good for the dog

[@TheArmedTramperNZ]

Absolutely!

[@poodlenz]

How did you mount your scope on the baikal?

[@poodlenz]

What is the length of your barrel?

[@kurtnorrell]

And the can? Haven't seen one go so far down the barrel when screwed on....i have a 16" barrel and would love to find a can that mounts like that....

[@TheArmedTramperNZ]

Hard Rifle Engineering 👍

[@TheArmedTramperNZ]

16”

[@kris308100]

Ahh found pt1. That gives me the info on the rounds I was looking for. A couple of questions....do you use a filler in the cases to take up excess volume?.Or does the trail boss eliminate the need for this as its such big particles?. I've seen videos of people using the stuffing out of soft toys for a filler?. As the trail boss is large how does it throw?. Also what barrel length and twist rate are you using in your rifle?. Many thanks for the info.

[@TheArmedTramperNZ]

16” barrel - can’t remember twist off hand, but have answered that question before so it’s in the comments here somewhere. Trail boss fills it nicely, not too loose, seems to burn well and fully. Throws fine through my hornady autocharge

[@xkguy]

10gr Trail Boss will nearly fill the case. It comes in the usual '1lb' canister but only has 9oz in it.

[@benjaminmartinez2832]

What suppressor are you using?

[@Howardlaly]

Really cool work! I have to say I’m surprised how loud it still is! Is that because it is such a light gun? There is some other videos out there with just a plopp-pling Sound. Anybody please enlighten me!

[@bartoszbaranowski604]

it is because recording eq usually adapts to ambient sound, check this: kzbin.info/www/bejne/aHndfn-sp6tpq5Y

[@surfinganddancing1609]

I don't know- that sounds supersonic to me. Pretty well defined "crrrraaack" as it breaks the sound barrier.

[@JMC881]

Awesome Nath. Cool little shooter

[@fits1966]

In oz this made me homesick

[@j8j200]

What is the twist rate and barrel length that you’re using?

[@TheArmedTramperNZ]

1-12 15”

[@WildNZ]

Awesome bro!

[@tonysilverfox2828]

Cool video

[@simonparker7779]

How did you work out where your starting load was?

[@simonparker7779]

The Armed Tramper that’s awesome thanks for that, we fired out first today used 10gr and slightly fast at 1168fps. So we are now just going to slowly reduce it. We are using the 168gr Lehigh bullets. Really enjoyed the KZbin video so well done really inspired us to get to it

[@bentomlin7404]

What effect does the size and shape change of the powder have on the burn of the powder?

[@TheArmedTramperNZ]

Fills the case better resulting in a more even ignition and burn 👍

[@bartoszbaranowski604]

how fast in burns is one factor.

[@jwatstom]

Nice bro!

[@baron30001]

Were did you get your cast projectiles?

[@baron30001]

Thanks man. You don’t happen to know the sellers username do you? Iv been watching tm for a while now and have only managed to get hold of 151grn bullets but i would prefer something closer to 200grm too.