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Hunting
Long Range Hunting & Shooting
Effect of Bullet Spin on Terminal Performance
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<blockquote data-quote="cohunt" data-source="post: 1694921" data-attributes="member: 94491"><p>A few years ago i read an online documentation where a guy did a test of twist rate vs bullet expansion.</p><p>He did a test of both lead core hunting bullets and monolithic hunting bullets (no target bullets were tested) he had 2 rifles in 6.8spc, 1 was a 1:12 twist and the other was a 1:8. </p><p>He loaded same charges with same bullets and shot them for expansion at 100,200&300 yards. </p><p>At all distances the bullets in the1:8 expanded better than the 1:12, and in some cases the 1:12 veered off course where the 1:8's did not. The additional expansion was even more pronounced in the monolithic bullets than the lead core bullets, but he used an attached petal monolithic bullet rather than a detaching petal design. </p><p>Wish I knew where to find that test, but it has lapsed from my memory in the last few years</p><p></p><p>As a side note, he also did a "reduced" velocity vs distance test to see if a bullet fired at a reduced velocity at close ranges matched the same velocity at longer distances and he noted that the bullets fired at full velocity - their expansion at distance of 400, vs a bullet fired at 50 yards at reduced velocity did not exhibit the exact same expansion-- he surmised that this was die to faster spin at distances due to the increased muzzle velocity.</p></blockquote><p></p>
[QUOTE="cohunt, post: 1694921, member: 94491"] A few years ago i read an online documentation where a guy did a test of twist rate vs bullet expansion. He did a test of both lead core hunting bullets and monolithic hunting bullets (no target bullets were tested) he had 2 rifles in 6.8spc, 1 was a 1:12 twist and the other was a 1:8. He loaded same charges with same bullets and shot them for expansion at 100,200&300 yards. At all distances the bullets in the1:8 expanded better than the 1:12, and in some cases the 1:12 veered off course where the 1:8's did not. The additional expansion was even more pronounced in the monolithic bullets than the lead core bullets, but he used an attached petal monolithic bullet rather than a detaching petal design. Wish I knew where to find that test, but it has lapsed from my memory in the last few years As a side note, he also did a "reduced" velocity vs distance test to see if a bullet fired at a reduced velocity at close ranges matched the same velocity at longer distances and he noted that the bullets fired at full velocity - their expansion at distance of 400, vs a bullet fired at 50 yards at reduced velocity did not exhibit the exact same expansion-- he surmised that this was die to faster spin at distances due to the increased muzzle velocity. [/QUOTE]
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Effect of Bullet Spin on Terminal Performance
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