Thread: 1:7" twist 308 Who's running a ultra fast twist, super sonic and why ?

So who's running a 300 Blackout barrel in their 308 Winchester at full noise and why ?
More interested in your super sonic experiences
Subs are easy and the twist will be perfect

Serious question for a real project

Have a 16 inch 1-8 Tikka 308. Shoots subs good. Currently shooting 168ELD-Ms. Not terribly fast out of 16 inch barrel though 2500fps springs to mind.

@tikka

STD 308 twist handles 190g subs and up to 208 amax/eldm

Can confirm.

standard 1:11 tikka 308 puts 190gr sub-x into sub-moa groups.

Have not tried anything heavier though.

I just know where a brand new SS semi finished 300 Blackout barrel blank is and it got me thinking if it would make a versatile 308 Win

Originally Posted by akaroa1

I just know where a brand new SS semi finished 300 Blackout barrel blank is and it got me thinking if it would make a versatile 308 Win

Bargain price !

Got a Bergara BA13 16” 1:8 308. Haven’t found anything it doesn’t shoot well with apart from 110gr projectiles. 110’s haven’t grouped that well but will keep experimenting. Got it to run subs with red dot sight but have shot about 90 animals with 150-165gr supers. Bit of a flamethrower though. Looks spectacular at night, especially without suppressor. Very user unfriendly without suppressor.

Originally Posted by woods223

Got a Bergara BA13 16” 1:8 308. Haven’t found anything it doesn’t shoot well with apart from 110gr projectiles. 110’s haven’t grouped that well but will keep experimenting. Got it to run subs with red dot sight but have shot about 90 animals with 150-165gr supers. Bit of a flamethrower though. Looks spectacular at night, especially without suppressor. Very user unfriendly without suppressor.

Ever tried faster burning powders to get rid of the flamethrowing? 8208 etc ? out if curiosity...

Not 8208, don’t have any and not fucking around trying to find any. Have used 2206h and 2219. 2219 goes alright but I tend to reserve that for 223. Back to reloading for that because of lack of Belmont ammo and not paying guncity or H&F prices for ammo unless I have to. The flamethrower effect is mostly with bought ammo.

The industry trend has been towards tighter and tighter twists, 1:7-8 are probably the most common these days is cartridges from 2600-3200fps.
308 seems to be one of the few cartridges that still comes standard in a slower twist but looking around the a few 1:8 twist barrels popping up.

If you go for a shorter barrel length I don't think 1:7 twist will be an issue with 308.
Especially considering 300 Norma is more or less standardized on a 1:8 twist.

If you don't end up buying the blank I'd be interested in it.
Been thinking of doing a 300blk Tikka build for a few years now.

had a similar idea once. After looking into it further I realized 308 can do everything a 300blk can do, and much more and a tikka bolt-action would not benefit from the shorter cartridge.

a mini-action on the other hand...

Originally Posted by STC

had a similar idea once. After looking into it further I realized 308 can do everything a 300blk can do, and much more and a tikka bolt-action would not benefit from the shorter cartridge.

a mini-action on the other hand...

If you want to run subs (which for better or worse I seem dead set on trying) the best powder option for 308 by far is trail boss.
With the availability of it currently being terrible, and it only forcast to get more scarce, it's not the best option if subsonics are on the menu.

Originally Posted by Beetroot

If you want to run subs (which for better or worse I seem dead set on trying) the best powder option for 308 by far is trail boss.
With the availability of it currently being terrible, and it only forcast to get more scarce, it's not the best option if subsonics are on the menu.

Yeh I'm down to my last 2 KGs of Trailboss so I will keep it for my
25 rimfire
32-20
38-40
44-40
And a few other modest old cases it really shines in

Originally Posted by Beetroot

If you want to run subs (which for better or worse I seem dead set on trying) the best powder option for 308 by far is trail boss.
With the availability of it currently being terrible, and it only forcast to get more scarce, it's not the best option if subsonics are on the menu.

Yep. Trailboss works indeed very well for subsonic loads for 308. Was lucky to be able to get some and am set, but i see what you mean.