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Long Range Hunting & Shooting
Weatherby Free Bore?
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<blockquote data-quote="Bart B" data-source="post: 344408" data-attributes="member: 5302"><p>Nobody makes a gain twist rifling uniform enough to have the pitch curve's change rate uniformly engrave the bullet. Accuracy will suffer. Gain twists went out with the dish water when jacketed bullets became "the" bullet for best accuracy over a hundred years ago. </p><p></p><p>Most makers of barrels used to shoot most accurate all agree that the biggest single reason for a barrel with zero tolerance bore and groove dimensions not shooting accurate is the twist rate ain't uniform. There's a few places that measure twist uniforming. And some folks cry in their milk when they learn their otherwise perfect barrel has irregular twist rate changes a few places in the bore.</p><p></p><p>Bullets typically glide easily into rifling whose helix angle is only about 5 to 6 degrees; not enough to cause the bullet to jump the rifling at even the highest initial velocites out of the case that's only a few hundred feet per second. Some folks feel a gain twist starting out with a slower than what's best for the bullet in flight will allow higher initial velocities and therefore higher muzzle velocities can be done with great accuracy. This is number 24 on the list of accurate shooting myths.</p></blockquote><p></p>
[QUOTE="Bart B, post: 344408, member: 5302"] Nobody makes a gain twist rifling uniform enough to have the pitch curve's change rate uniformly engrave the bullet. Accuracy will suffer. Gain twists went out with the dish water when jacketed bullets became "the" bullet for best accuracy over a hundred years ago. Most makers of barrels used to shoot most accurate all agree that the biggest single reason for a barrel with zero tolerance bore and groove dimensions not shooting accurate is the twist rate ain't uniform. There's a few places that measure twist uniforming. And some folks cry in their milk when they learn their otherwise perfect barrel has irregular twist rate changes a few places in the bore. Bullets typically glide easily into rifling whose helix angle is only about 5 to 6 degrees; not enough to cause the bullet to jump the rifling at even the highest initial velocites out of the case that's only a few hundred feet per second. Some folks feel a gain twist starting out with a slower than what's best for the bullet in flight will allow higher initial velocities and therefore higher muzzle velocities can be done with great accuracy. This is number 24 on the list of accurate shooting myths. [/QUOTE]
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