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30-284 / coyote / gallon milk jugs
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<blockquote data-quote="1ASSASSIN" data-source="post: 1458772" data-attributes="member: 106291"><p>My load is compressed using H-414 powder, as I could not get enough 4350 or 4831 into the case to hit a maximum load. Even with a compressed load of H-414, I still have not hit a maximum load in this gun.</p><p></p><p>Slower burn rate powders like H-1000 and IMR-7828 produced loads considerably slower than H-414 and they were compressed, and still no maximum load!</p><p></p><p>H-414 produced the greatest accuracy with the greatest velocity, with my chosen bullet. I'm sure a change in bullet weight would alter everything, but I'm not about to find out. I set this gun up specifically for the 155 gr. A-MAX bullets, and I see no point it changing anything.</p><p></p><p>Example:</p><p></p><p>Take the 284 Winchester case and neck it down to 6mm, 257, 6.5, 284, and .30 caliber. Develope a 100 gr. bullet load in the 6mm. Then put that same load in all the other 284 base cartridges with a 100 gr. bullet, and each time you go up a caliber, pressures will keep getting lower. The larger the bullet diameter, the lower the pressures, given the same case dimensions, with no other basic changes.</p><p></p><p>Like most things in life though, not everything is carved in stone. Throat diameter, lead angle, freebore length and such all come into play as well.</p><p></p><p>But in general, the larger the bore diameter, the lower the pressures, and when you crank up the pressures, you also crank up the velocity.</p><p></p><p>I also said in the beginning of this post, that I had a "fast" barrel. I have seen other 30-284 rifles that would not touch 3,000 fps. with their best load and a 150 gr. bullet. </p><p></p><p>My favorite cartridge, the 6mm-284 is not always FAST either. I have seen this cartridge do 3,900 fps. with Sierra's 85 gr. B.T. - H.P. Game King in certain barrels, and I have seen identical set ups that would not even come close to 3,400 fps. before maxing out full tilt!</p><p></p><p>This could get rather lengthy, so I'll stop here. I just hope I explained things good enough, but if not, then just ask!</p></blockquote><p></p>
[QUOTE="1ASSASSIN, post: 1458772, member: 106291"] My load is compressed using H-414 powder, as I could not get enough 4350 or 4831 into the case to hit a maximum load. Even with a compressed load of H-414, I still have not hit a maximum load in this gun. Slower burn rate powders like H-1000 and IMR-7828 produced loads considerably slower than H-414 and they were compressed, and still no maximum load! H-414 produced the greatest accuracy with the greatest velocity, with my chosen bullet. I'm sure a change in bullet weight would alter everything, but I'm not about to find out. I set this gun up specifically for the 155 gr. A-MAX bullets, and I see no point it changing anything. Example: Take the 284 Winchester case and neck it down to 6mm, 257, 6.5, 284, and .30 caliber. Develope a 100 gr. bullet load in the 6mm. Then put that same load in all the other 284 base cartridges with a 100 gr. bullet, and each time you go up a caliber, pressures will keep getting lower. The larger the bullet diameter, the lower the pressures, given the same case dimensions, with no other basic changes. Like most things in life though, not everything is carved in stone. Throat diameter, lead angle, freebore length and such all come into play as well. But in general, the larger the bore diameter, the lower the pressures, and when you crank up the pressures, you also crank up the velocity. I also said in the beginning of this post, that I had a "fast" barrel. I have seen other 30-284 rifles that would not touch 3,000 fps. with their best load and a 150 gr. bullet. My favorite cartridge, the 6mm-284 is not always FAST either. I have seen this cartridge do 3,900 fps. with Sierra's 85 gr. B.T. - H.P. Game King in certain barrels, and I have seen identical set ups that would not even come close to 3,400 fps. before maxing out full tilt! This could get rather lengthy, so I'll stop here. I just hope I explained things good enough, but if not, then just ask! [/QUOTE]
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