Hey everyone, new to the forum, but I've been reading on here for a little while and figured I'd see if I could get some help with a problem I've been having with this new round. Shooting the .224 Valkyrie 90 grain Sierra MatchKing factory loads, I have found that about 15% of the rounds I fire are blowing or dropping primers. Its been frustrating in the sense that I've gone through about 180 rounds trying to properly fix the problem. With that being said I've run about 120 rounds of the Federal Fusion 90 grains through the rifle as well. I'm going to give everyone the specs on the rifle, as well as the true data that I've gathered from my last attempt to fix the issue and see if maybe anyone can help diagnose the issue I'm having...
Specs:
Savage MSR Recon .224 Valkyrie
18" Barrel 1/7 twist
Gun is completely stock except for a Silencerco Omega suppressor, and a Magpul PRS Gen III stock
Ammo
.224 Valkyrie Federal Gold Metal Match 90 gr Sierra MK
Box says 2700 FPS (I believe a 24" test barrel)
True data
Zeroing Weather was 71.6 degrees F, 52% humidity, 154 ft. Altitude, BP 30.233
Line of sight angle 4.1 degrees
BC .563 G1
sight height 2.75"
drop at 200 .5" high
zero approx 214 yards
drop at 302 -8.15"
drop at 402 -14.9"
my math puts the muzzle velocity at 2908 fps, and please by all means check me
I've done some reading in some articles that are showing close to 2800 fps out of these particular rounds, but nothing quite to what I can figure on mine without current access to a chronograph, so I was especially particular when gathering these figures, in fact all 5 rounds fired at 400 yards had exactly the same drop to less that 1/10 of an inch. I have the adjustable gas block set 1/2 turn up from the rifle short-stroking. Before anybody asks, the drops are within an inch of each other without the suppressor. In my very limited opening I think its a timing issue, as in the bolt trying to open before the cartridge has been able to turn loose all the way, and I'll include some pictures of the brass at the bottom.
Aside from these issues, that I'm hoping the fine folks here on this forum can help me work out, I'm extremely happy so far with the gun, especially being a stock gun. The trigger is great, and I've consistently shot sub .MOA groups with it out to 520 yards so far. I'd have stretched it much further by now had it not been for the occasional malfunction due to a loose primer. I've sent the last box of ammo back to Federal to be tested for pressure and muzzle velocity to make sure its not an ammo issue. I'm considering trying a heavier buffer to start with to try to slow the bolt opening just a hair to begin with, let me know what you guys think, and thanks...
Pictures
Savage MSR Recon .224 Valkyrie
View attachment 6878658
Brass
View attachment 6878663
View attachment 6878662
View attachment 6878659