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Rifles, Reloading, Optics, Equipment
Suppressors
Suppressor problems (and resolutions) thread
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<blockquote data-quote="Mike6158" data-source="post: 2847539" data-attributes="member: 1039"><p>I looked up my AR barrel specs. 1:7 twist, same as the ranch rifle. The Berger twist rate stability calculator vaporized my unstable bullet theory. Even at 500 fps it's stable. It's marginally stable between 266 and 100 fps. I used current afternoon temps of 100 deg F. At 80 deg F it degrades to marginal stability starting at 297 fps. I didn't check where it goes unstable. </p><p></p><p>Looking at a ballistic calculator, 220 gr subsonic, MV = 1,050, and at 300 yards the velocity is supposed to be 968 fps. You have to have significant elevation to get it down there. Almost 10'. I've tried hitting steel at 300 and based on the puffs of dust the bullet I was shooting was landing all over the place. Not indicative of a stable bullet at all. That was with a 190 gr SUB-X not a Berger or SMK. MV on that one was 1,032 (using a LabRadar). At 300 yards the solver says it was still travelling 915 fps. Bottom line, the bullet might not be the issue. lol Might... seems to be the word that applies the most.</p></blockquote><p></p>
[QUOTE="Mike6158, post: 2847539, member: 1039"] I looked up my AR barrel specs. 1:7 twist, same as the ranch rifle. The Berger twist rate stability calculator vaporized my unstable bullet theory. Even at 500 fps it's stable. It's marginally stable between 266 and 100 fps. I used current afternoon temps of 100 deg F. At 80 deg F it degrades to marginal stability starting at 297 fps. I didn't check where it goes unstable. Looking at a ballistic calculator, 220 gr subsonic, MV = 1,050, and at 300 yards the velocity is supposed to be 968 fps. You have to have significant elevation to get it down there. Almost 10'. I've tried hitting steel at 300 and based on the puffs of dust the bullet I was shooting was landing all over the place. Not indicative of a stable bullet at all. That was with a 190 gr SUB-X not a Berger or SMK. MV on that one was 1,032 (using a LabRadar). At 300 yards the solver says it was still travelling 915 fps. Bottom line, the bullet might not be the issue. lol Might... seems to be the word that applies the most. [/QUOTE]
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Suppressor problems (and resolutions) thread
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