8.6 BLK Thread

[STFU]

Bullet RPM = MV X 720/Twist Rate (in inches)

For a subsonic - 1050 x 720/3 = 252,000 rpm (300gn Matchking)
For a supersonic - 1970 x 720/3 = 472,800 rpm (210gn Barnes TSX)

For comparison -
308 supersonic - 2800 x 720/12 = 168,000 rpm

For further comparison:

(300BLK) MUZZLE VELOCITY​	TWIST RATE​	BULLET RPM​
1070​	8​	96,300
1070​	7​	110,057
2077​	8​	186,930
2077​	7​	213,634

1070 fps is my home brew 220gr
2077 fps is S&B 147gr

That 1:3 twist is amazing...

 

[Jowl1]

8in 8.6 sig cross

 

[Aszerigan]

Just got notice. - Starline is releasing their first batches of 8.6 to dealers now. It is now an officially mainstream cartridge.

 

[Aszerigan]

Fortunately though, the cost of 8.6 BLK ammo and guns will keep me from making a "this is so cool" purchase for the time being.

Hey, guess what? You’re a two-timer now.

 

[rb288]

I just picked up my 8" 8.6 barrel.
Once I get that ar-10 build finished I am going to go on a quest to compare bullet performance in 8", 12" and 16" barrels, as in same bullet, same load velocities, accuracy, sound, and effectiveness in ballistic gel blocks.
Very unscientific, but good information to know.
It might be a month or two to compete, but I'll report it all here when finished.

 

[profjeremy]

Hey, guess what? You’re a two-timer now.

Suppressors are clearly a gateway drug and apparently I’m well on my way to being a junkie!