PDA

View Full Version : .300 Blackout Contender


cohiba
01-07-12, 21:50
I was interested in .300 Blackout but really have no interest in getting an upper and building another rifle. Fortunately, I had a .300 Whisper barrel lying around from years ago that I never used along with a T/C frame. The bull barrel was only 14" so a SF muzzle brake was perm attached to give a barrel length of 16.5". The barrel twist is 1:10.

The threading of the barrel meant that the front sight had to be moved back and reattached. For mounting optics/lasers/lights, a custom 1913 rail was made with 20 MOA built in.

I have a SF 7.62k can for it that I am awaiting approval on. In the test firing at the shop, the subsonic load was ridiculously quiet. Basically the hammer hitting the firing pin.

The rail lets me mount a T-1 or for even more fun, this Attila 200 IR laser. When used in conjunction with my PVS-14s, this would be a mighty fine Texas hog hunt gun:cool:

http://i20.photobucket.com/albums/b243/conndcj/300blk001-1.jpg

http://i20.photobucket.com/albums/b243/conndcj/300blk002-1.jpg

http://i20.photobucket.com/albums/b243/conndcj/300blk003-1.jpg

http://i20.photobucket.com/albums/b243/conndcj/300blk004-1.jpg
Todd.K
01-07-12, 22:12
The barrel twist is 1:10...subsonic...

I would not use the 220gr subs in that twist.
cohiba
01-08-12, 10:57
Todd, I understand that 1/8 is optimal. This was test fired at 50 yds without the can and there was no keyholing or any evidence of instability. I wanted to make sure because I didn't want to ventilate an expensive suppressor. Maybe I have the twist wrong.

Should I go out farther before trusting the can on it? Thanks.
Todd.K
01-08-12, 11:41
The stability is just too marginal for me, under normal conditions I'm not supprized the bullets are stabilized.

Do you handload?
rsilvers
01-08-12, 16:10
If I had a 1/10 twist, I would use the Lapua 200 grain bullets.
cohiba
01-08-12, 20:17
The stability is just too marginal for me, under normal conditions I'm not supprized the bullets are stabilized.

Do you handload?

Yes Sir, I am an experienced handloader.
Todd.K
01-08-12, 23:01
No worries then, with a single shot you don't need to run the heavier bullets for cycling and you can load lighter, cheaper bullets subsoninc.