Need Input On My New 300 "whatever" Rifle

[Code_4]

Ok this thing has got me baffled. It sounds loud as hell to me and I would like some input on what you peeps think.

Here is the gun:
10" 300 blackout barrel
Pistol gas with Paladin Machine Block
FailZero BCG, Ranier Upper
Can is a Liberty Black Raven II

I am running 11.5 grains of AA1680 with 220 SMK at 1050fps. Gun runs great with ejecting and BHO working on last round.

The thing sounds loud as hell to me even when I am standing away from it. I have never heard another 300 "whatever" so I have no basis. I guess I am comparing it to my Sub 308 bolt gun and the same can. There is a hell of a pop on the semi auto and does not feel hearing safe to me. Also if I shut the gas totally off it seems even louder...wtf?

Anyway if you have any input let me know. The YT Channel below has the vids of the 300 "whatever" and my 308 bolt gun with Subs and Supers. Same shitty Droid video camera about 10 foot away.

http://www.youtube.com/user/Code9mm?feature=mhum

[ds762]

videos are hard to tell over the net sometimes ..

I'll bet you are getting action noise along with your loads being "on the edge" of going supersonic.

I have no experiance with that powder as I try to use H110 whenever possible .. its what works for me.

my honest suggestion would be to try different powders and different powder charges.

sorry I cant offer more help.

[Code_4]

Originally Posted by ds762

videos are hard to tell over the net sometimes ..

I'll bet you are getting action noise along with your loads being "on the edge" of going supersonic.

I have no experiance with that powder as I try to use H110 whenever possible .. its what works for me.

my honest suggestion would be to try different powders and different powder charges.

sorry I cant offer more help.

I hear you on videos not being great. I am using a chrony so I know where the loads are shooting. They are staying well below subsonic.
I have already tried 2 other powders. H110 and 4227. Neither will cycle the rifle in the subsonic range. They all have they same sound when fired. It is really a shot pop sound and not out in front with a super crack.

[ds762]

Originally Posted by Code_4

I hear you on videos not being great. I am using a chrony so I know where the loads are shooting. They are staying well below subsonic.
I have already tried 2 other powders. H110 and 4227. Neither will cycle the rifle in the subsonic range. They all have they same sound when fired. It is really a shot pop sound and not out in front with a super crack.

just brainstorming ..

what velocities are you getting through the chrono?
what powder charges have you tried?
have you tried a different suppressor? I know Liberty makes good stuff just thinking out loud.

something is not right .. hopefully with enough info we can (as a forum) get you headed in the right direction.

[Code_4]

I am in the 1020 to 1040 range. I started at 12.5 and worked down to that load. My 9mm can would work, but it's threaded 1/2x28 so I need an adapter. I know the Liberty can is pellet gun quiet with my 18" .308 sending 160FTX's with Trailboss.

[Retooferab]

Try reducing your charge. A few tenths less will not change the velocity much and if you run them around a 1000 fps it will quieten down some 1680 seemed louder in my ar also. I am using N110 and AA9 now.