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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why doesn't accuracy always hold up?
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<blockquote data-quote="Mysticplayer" data-source="post: 29124" data-attributes="member: 8947"><p><strong>Re: Why doesn\'t accuracy always hold up?</strong></p><p></p><p>Houston Boy, since you are using a good quality bullet, I will leave bullet manf out of the discussion.</p><p></p><p>What I would suggest is that the 1 in 12 twist of your barrel/muzz vel, is not spinning the bullet fast enough and the bullet is loosing stability at LR. Either increase muzzle vel or go to a faster twist and problem will correct itself. Remember that twist rate will vary even with the same numerical twist. Also, internal dimensions of the rifling will affect the true spin rate of the bullet.</p><p></p><p>Are you using the same powder? Maybe the burn rate is not suited to the heavier bullet? A change in powder may help with vel variations and thus stringing. How are the vel spreads?</p><p></p><p>Otherwise, the LR performance should be similar to groupings at ranges beyond 200yds (I like to test at 250yds) as long as wind is not a factor and the bullet stays supersonic.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 29124, member: 8947"] [b]Re: Why doesn\'t accuracy always hold up?[/b] Houston Boy, since you are using a good quality bullet, I will leave bullet manf out of the discussion. What I would suggest is that the 1 in 12 twist of your barrel/muzz vel, is not spinning the bullet fast enough and the bullet is loosing stability at LR. Either increase muzzle vel or go to a faster twist and problem will correct itself. Remember that twist rate will vary even with the same numerical twist. Also, internal dimensions of the rifling will affect the true spin rate of the bullet. Are you using the same powder? Maybe the burn rate is not suited to the heavier bullet? A change in powder may help with vel variations and thus stringing. How are the vel spreads? Otherwise, the LR performance should be similar to groupings at ranges beyond 200yds (I like to test at 250yds) as long as wind is not a factor and the bullet stays supersonic. Jerry [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Why doesn't accuracy always hold up?
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