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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
LIGHTEST BULLET FOR 243Win w/ 8" twist
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<blockquote data-quote="Bart B" data-source="post: 1154046" data-attributes="member: 5302"><p>It's my experience that light bullets of poor quality (pulled M80 7.62 NATO bullets) ) spun too fast leaving the barrel (max load in .300 Wby Mag with 1:10 twist) shoot less accurate than well balanced ones (Sierra 150 HPMK). The higher centrifugal forces cause them to jump off the muzzle axis upon exit from the barrel. Those M80 bullets shot a lot more accurate in a 21" long 1:12 twist .308 Win sporter barrel; almost as good as the Sierra HPMK's.</p><p></p><p>A friend of mine spun some 30 caliber 185-gr match bullets in a Dremel Moto tool holding a collet shaped to hold them point in. An amp meter was connected inline on the power cord. At 30,000 rpm, the unbalanced ones drew more current than the perfect ones. A few were so bad they flew out of the collet bouncing off the ceiling and walls of the shop they were tested in. 10-shot test groups were fired from a machine rested .308 Win. rifle at 600 yards. Perfect bullets' groups ranged from 1.5 inch down to 0.7 inch. A 40-shot group was 1.92" extreme spread. Some of the unbalanced ones' groups were over 10 inches. Go figure that out. That brand and bullet types back then were well known for having a few in each box of 100 that shot far away from point of aim.</p></blockquote><p></p>
[QUOTE="Bart B, post: 1154046, member: 5302"] It's my experience that light bullets of poor quality (pulled M80 7.62 NATO bullets) ) spun too fast leaving the barrel (max load in .300 Wby Mag with 1:10 twist) shoot less accurate than well balanced ones (Sierra 150 HPMK). The higher centrifugal forces cause them to jump off the muzzle axis upon exit from the barrel. Those M80 bullets shot a lot more accurate in a 21" long 1:12 twist .308 Win sporter barrel; almost as good as the Sierra HPMK's. A friend of mine spun some 30 caliber 185-gr match bullets in a Dremel Moto tool holding a collet shaped to hold them point in. An amp meter was connected inline on the power cord. At 30,000 rpm, the unbalanced ones drew more current than the perfect ones. A few were so bad they flew out of the collet bouncing off the ceiling and walls of the shop they were tested in. 10-shot test groups were fired from a machine rested .308 Win. rifle at 600 yards. Perfect bullets' groups ranged from 1.5 inch down to 0.7 inch. A 40-shot group was 1.92" extreme spread. Some of the unbalanced ones' groups were over 10 inches. Go figure that out. That brand and bullet types back then were well known for having a few in each box of 100 that shot far away from point of aim. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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LIGHTEST BULLET FOR 243Win w/ 8" twist
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