Just shot some American Eagle 220 grain subsonic 300 Blackout. Horizontally they all stay within 1/2 inch but they string vertically by about 2 inches. All stay within 1/4 inch of each other. Checked and rechecked the mount and all was tight. Shooting a YHM Phantom on a Riggio Arsenal lower with an unknown upper. Without the suppressor, all shots cluster in an acceptable group.
Any thoughts and recommendations? Thanks
Vertical stringing when suppressed
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- curtistactical
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Re: Vertical stringing when suppressed
My thoughts would be inconsistent loads, you would need to chrono the shots to know for sure but this would be my first guess.Ratbat wrote:Just shot some American Eagle 220 grain subsonic 300 Blackout. Horizontally they all stay within 1/2 inch but they string vertically by about 2 inches. All stay within 1/4 inch of each other. Checked and rechecked the mount and all was tight. Shooting a YHM Phantom on a Riggio Arsenal lower with an unknown upper. Without the suppressor, all shots cluster in an acceptable group.
Any thoughts and recommendations? Thanks
Joseph Jones
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- CanOfWhooppass
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Re: Vertical stringing when suppressed
How was the rifle supported? Any chance a sandbag was touching the barrel or suppressor?
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Re: Vertical stringing when suppressed
Ammo all came from the same box and the rifle was supported on a rest with just the free floating handguard touching. I would load 10 in the magazine, fire five with the suppressor on, fire five with the suppressor off, on side by side targets. Same result each time.
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Re: Vertical stringing when suppressed
My guess would be what curtistactical said. You didn't mention the range you were shooting at but I'm going to assume 100 yards. An ever so slight variance in powder (.1 grain or even less) behind a heavy projectile traveling at subsonic speeds can really make a difference at 100. 50 FPS variance with rounds traveling 3,000FPS vs 50 FPS variance traveling 1,000FPS means a much larger difference at 100 with the heavy subs.
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Re: Vertical stringing when suppressed
Would you be able to post pics of the targets?
What is the actual group size, suppressed and unsuppressed?
Do you remember which way the suppressed hits traveled? Meaning, did they start low and climb, as you continued to fire?
What is the actual group size, suppressed and unsuppressed?
Do you remember which way the suppressed hits traveled? Meaning, did they start low and climb, as you continued to fire?
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Re: Vertical stringing when suppressed
If the unsuppressed shots grouped better it's unlikely it's an ammo variation issue unless that is just a bizarre coincidence that it just happened to be in the five rounds tested.
- CanOfWhooppass
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Re: Vertical stringing when suppressed
I'm guessing that with the weight of the suppressor some barrel mechanics is in play. If it's off a sandbag and the barrel gets partialy supported from the sandbag touching it, that could cause the barrel to shoot from different levels of flex.
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Re: Vertical stringing when suppressed
It could be from the heat if you're firing very fast. The suppressor adds enough weight that barrel heating would be more pronounced with the can on.