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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Perfect Bullet Weight/Velocity Combination
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<blockquote data-quote="Mark_in_utah" data-source="post: 30082" data-attributes="member: 1503"><p>I've found kind of an answer to your question, but it's range dependant. My studies were wheich bullet shoots the flattest. Accuracy was not part of the calculations. </p><p></p><p>As you know there's a bullet weight/velocity tradeoff for each cartridge. A given cartridge can do a decent job maintaining the velocity until the bullet weight reaches a certain point and then it starts to drop off. Lengthening the barrel can stretch this out to heavier bullets, but the effect is still there.</p><p></p><p>For my own guns, and the programs I've run, here are a few basics for some standrad calibers that I have. All results are based upon standard rifle barrels, a 200 yard zero, and give the minimum drop at 400 yards:</p><p></p><p>.270 win - 130 grain</p><p>7mm Rem Mag - 150 grain, 120 grain was right next to it.</p><p>30-06 - about 165-175 grains (still need to study more)</p><p>.338 RUM - 185 - 200 grains.</p><p></p><p>As far as accuracy goes, my .270 likes 130 grain bullets the best, my 7 mag likes 150 grain bullets the best, and my .338 RUM likes 250 grain bullets the best. The 250 grain bullets have 2" more drop at 400 yards than the 200 grain bullets.</p><p></p><p>An interesting side note is that the .338 RUM shoots faster and flatter than the .300 RUM, even when shooting heavier bullets, and with less recoil! This begs the question, why would anyone EVER want a .300 RUM? Are the .30 caliber bullets that much better than the .338 bullets?</p><p></p><p>That's my $0.02, your mileage may vary.</p><p></p><p>Mark in Utah</p></blockquote><p></p>
[QUOTE="Mark_in_utah, post: 30082, member: 1503"] I've found kind of an answer to your question, but it's range dependant. My studies were wheich bullet shoots the flattest. Accuracy was not part of the calculations. As you know there's a bullet weight/velocity tradeoff for each cartridge. A given cartridge can do a decent job maintaining the velocity until the bullet weight reaches a certain point and then it starts to drop off. Lengthening the barrel can stretch this out to heavier bullets, but the effect is still there. For my own guns, and the programs I've run, here are a few basics for some standrad calibers that I have. All results are based upon standard rifle barrels, a 200 yard zero, and give the minimum drop at 400 yards: .270 win - 130 grain 7mm Rem Mag - 150 grain, 120 grain was right next to it. 30-06 - about 165-175 grains (still need to study more) .338 RUM - 185 - 200 grains. As far as accuracy goes, my .270 likes 130 grain bullets the best, my 7 mag likes 150 grain bullets the best, and my .338 RUM likes 250 grain bullets the best. The 250 grain bullets have 2" more drop at 400 yards than the 200 grain bullets. An interesting side note is that the .338 RUM shoots faster and flatter than the .300 RUM, even when shooting heavier bullets, and with less recoil! This begs the question, why would anyone EVER want a .300 RUM? Are the .30 caliber bullets that much better than the .338 bullets? That's my $0.02, your mileage may vary. Mark in Utah [/QUOTE]
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Perfect Bullet Weight/Velocity Combination
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