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22 creed 73gr Absolute hammers!
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<blockquote data-quote="DMP25-06" data-source="post: 2232486" data-attributes="member: 27271"><p>beaueel ,</p><p></p><p>You are over-spinning the 55gr. V-Max</p><p>3700FPS in a 1:8" twist barrel produces 333,000 RPM's of rotational speed .</p><p>That same bullet and 3700 FPS velocity in a 1:12" twist barrel produces 222,000 RPM's of rotational speed . Check with Hornady , I think that the V-Max is not strong enough to handle that many Revolutions Per Minute .</p><p>In a 12" twist barrel , you would have to achieve a muzzle velocity of 5550 FPS in order to achieve 333,000 RPM's .</p><p></p><p>Now , the Sierra 69gr bullet is definitely stronger construction , as it is achieving 324,000 RPM's .</p><p></p><p>Formula to determine RPM's is</p><p>1 foot ( 12" ) divided by barrel twist ( 8" ) , 12 divided by 8 = 1.5 x 3700 fps = 5550 x 60 (seconds) = 333,000 RPM's.</p><p></p><p>Use longer , heavier bullets at appropriately lower speeds in your 1:8" twist barrel .</p><p></p><p>DMP25-06</p></blockquote><p></p>
[QUOTE="DMP25-06, post: 2232486, member: 27271"] beaueel , You are over-spinning the 55gr. V-Max 3700FPS in a 1:8" twist barrel produces 333,000 RPM's of rotational speed . That same bullet and 3700 FPS velocity in a 1:12" twist barrel produces 222,000 RPM's of rotational speed . Check with Hornady , I think that the V-Max is not strong enough to handle that many Revolutions Per Minute . In a 12" twist barrel , you would have to achieve a muzzle velocity of 5550 FPS in order to achieve 333,000 RPM's . Now , the Sierra 69gr bullet is definitely stronger construction , as it is achieving 324,000 RPM's . Formula to determine RPM's is 1 foot ( 12" ) divided by barrel twist ( 8" ) , 12 divided by 8 = 1.5 x 3700 fps = 5550 x 60 (seconds) = 333,000 RPM's. Use longer , heavier bullets at appropriately lower speeds in your 1:8" twist barrel . DMP25-06 [/QUOTE]
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22 creed 73gr Absolute hammers!
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