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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What really makes it a magnum?
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<blockquote data-quote="Bart B" data-source="post: 680598" data-attributes="member: 5302"><p>I agree. Too bad it's performance in competition wasn't fully utilized after the .308 Win. chambered barrels started kicking it off the firing lines in 1963. Had the .30-06 commercial chambers had a 1.5 degree leade angle in a 1:12 twist bore, it would have shot just as accurate as the .308's did with the same leade angle and twists. So it was not the cartridge that made in unpopular, it was the chamber and bore specs used that dealt the .30-06 its death knell in competition.</p><p></p><p>While the .30-03's 220-gr. round nose needed a 1:10 twist, that's too fast for best performance with a 150-gr. spitzer at .30-06 muzzle velocities. And the 172-gr. FMJBT machine gun bullet that came out in the 1920's for the .30-06 also was best with a 1:12 twist. </p><p></p><p>Harry Pope (barrel maker extraordinaire) knew the .30-06's 150-gr. bullet would shoot much more accurate if the barrels were rifled with a 1:12 twist. Mr. Pope's said to have contacted the government and strongly suggested they use a 1:12 twist for the new '06 cartridge, but Uncle Sam chose to keep using the 1:10 twist. When Harry was contracted to make barrels for the M1903's for use in the Palma long range matches, he had to profile them the same as the arsenal barrels were. He said (in so many words): "OK, I'll make 'em on the outside like you want, but I'll make 'em on the inside like I want." He used 1"12 twists with his bore and groove specs and the USA team won the next big world championship long range matches with them.</p></blockquote><p></p>
[QUOTE="Bart B, post: 680598, member: 5302"] I agree. Too bad it's performance in competition wasn't fully utilized after the .308 Win. chambered barrels started kicking it off the firing lines in 1963. Had the .30-06 commercial chambers had a 1.5 degree leade angle in a 1:12 twist bore, it would have shot just as accurate as the .308's did with the same leade angle and twists. So it was not the cartridge that made in unpopular, it was the chamber and bore specs used that dealt the .30-06 its death knell in competition. While the .30-03's 220-gr. round nose needed a 1:10 twist, that's too fast for best performance with a 150-gr. spitzer at .30-06 muzzle velocities. And the 172-gr. FMJBT machine gun bullet that came out in the 1920's for the .30-06 also was best with a 1:12 twist. Harry Pope (barrel maker extraordinaire) knew the .30-06's 150-gr. bullet would shoot much more accurate if the barrels were rifled with a 1:12 twist. Mr. Pope's said to have contacted the government and strongly suggested they use a 1:12 twist for the new '06 cartridge, but Uncle Sam chose to keep using the 1:10 twist. When Harry was contracted to make barrels for the M1903's for use in the Palma long range matches, he had to profile them the same as the arsenal barrels were. He said (in so many words): "OK, I'll make 'em on the outside like you want, but I'll make 'em on the inside like I want." He used 1"12 twists with his bore and groove specs and the USA team won the next big world championship long range matches with them. [/QUOTE]
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What really makes it a magnum?
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