.300 Blackout

[Justfun]

Going to put a .300 Blackout barrel on a XP-100 action. Mostly a toy, but might shoot a deer with it and will probably use something like a 125 ballistic tip.
Barrel will be 18 or 20 inch. Need some twist recommendations or other ideas, this is a new caliber for me.

Thanks

 

[Minesweeper3433]

If your going with a longer barrel such as 18-20 don't use a pistol length gas system. I've seen a few companies coming out with pistol length 16"+ barrels and while it works great with subsonics and a suppressor not so great supersonic.

 

[Rpbump]

I have an older T/C barrel in 300 Whisper, 10", 8 twist. If you plan on shooting subsonic ammo
(less than 1100 fps) and heavy bullets a 8 twist barrel is required. The Blackout and Whisper rounds are interchangeable in my barrel an both are very accurate.


Rpbump

 

[shoot4fun]

If your going with a longer barrel such as 18-20 don't use a pistol length gas system. I've seen a few companies coming out with pistol length 16"+ barrels and while it works great with subsonics and a suppressor not so great supersonic.

I don't see the OP needing a gas system for a bolt gun.

Now to the question at hand, a 1 in 8 twist seems optimal (most companies use it for BLK) and that is what I would use. The BLK is a fun round; provides good stopping power and low recoil. Shooting subsonic suppressed gave me surprising results out to 200 yards in the accuracy arena.

 

[RonS]

My two cents for what it's worth is go with a 12 twist for the lighter bullets. I don't have a 300 BLK but I do have a Wilson Combat 7.62x40WT in an AR and boltgun. The AR is a 12 twist with a 18" barrel that loves the 125's and prints on a good day under 1 MOA at 200 yards. My Savage / Wilson Combat bolt gun has a 20" 12 twist barrel loves 135's & 150's pushed between 2200 - 2400 fps and it prints under 1 MOA at 100 yards both using 1680 powder and CCI400's. The 7.62x40WT is a shortened 223 case that's 5mm longer than the 300 BLK.

 

[Spook]

16 inch 8 twist and you'll be fine.

 

[X-Caveman]

Yes. 16", 8 twist. I'll add that you ought to go ahead and make sure you've got a 5/8"-24 threaded muzzle. 208 A-Maxes or 220 SMKs going about 1,000 FPS suppressed is a real hoot!

 

[1shot]

+1 to both AlloyTargets and Spook. I build one on a AR host and topped it off with a sandstorm. It shoots 125 and 208 equally well and is more fun than the law should allow. (But I'm sure glad they do.)

 

[pauls]

16 inch 8 twist and you'll be fine.

What he said above. This is mine. Love it. Hollywood quiet.

 

[gary0529]

Had mine built on an XR action well over 7 years ago and love it.
Used a 1:8 Lilja barrel, threaded for the suppressor and shoot basically heavy subsonic bullets.
It is the cats pajamas on deer. I have transitioned to using either Lehigh or Outlaw States heavy bullets for deer and pest control-they work GREAT.
I play with 220 and 240 Sierra's on paper and steel targets but reserve the more expensive but totally dependable "specials" for deer.

Highly accurate out to 150 yards-whisper quiet since there is no action noise clattering.

Enjoy

Gary

 

[gary0529]

PS

Spent the bucks and put on a 2# Jewell trigger--never have looked back or second guessed my decisions to use a Jewell whenever possible.

Gary