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Rifles, Reloading, Optics, Equipment
Reloading
.375 H&H 300g bullets best velocity
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<blockquote data-quote="benchracer" data-source="post: 889273" data-attributes="member: 22069"><p>The issue with RL19 isn't case capacity, it's burn rate. It will not behave the same in a larger bore as it does in a .300WM. In a larger bore, the volume for expansion of powder gases increases more rapidly as the bullet moves down the bore. That requires faster powders relative to a smaller bore with a similar case capacity. </p><p> </p><p> I have confirmed to my satisfaction that powders slower than H4350 actually reduce velocity in the 375 H&H during my tests with the 350g SMK, which included H4831. RL19 is in the same burn rate range as H4831 and highly unlikely to offer enough increase over H4831 to overcome the 100fps advantage of H4350 and the nearly 150fps advantage of RL17 in the H&H case.</p><p> </p><p> While it's true that there is room to increase case capacity to gain velocity, the point of my quest is to maximize the capabilities of the H&H. That is why I do not intend to go with the Weatherby chambering. My original goals are well within reach and have actually been exceeded. The real challenge for me now is finding the accuracy level necessary to make it all work at long range.</p><p> </p><p> I, too, am disappointed that Hornady has dropped the 300g BTSP. It was an excellent bullet. I am hopeful that Hornady intends to offer an improved bullet in its place in the near future. Will have to wait and see. If not, there are alternatives that will suit my purposes. </p><p> </p><p> The reason that I have been using the Hornady bullet to begin with is that my earlier testing confirmed very similar pressure and velocity behavior to the Cutting Edge 300g MTH, which is ultimately the bullet that I wish to use for long range. Because the MTH bullets cost $2+/bullet, I am doing the majority of my development with the much less expensive Hornady bullet, which will get me in the ballpark. I can then fine tune the MTH from there.</p><p> </p><p> That is the reason I have not worked with lighter bullets like the Accubond, though they have similar bc's and can be driven much faster. The Accubond has nowhere near the long range potential that the 300g and 320g MTH's do, and that is what I am ultimately chasing.</p></blockquote><p></p>
[QUOTE="benchracer, post: 889273, member: 22069"] The issue with RL19 isn't case capacity, it's burn rate. It will not behave the same in a larger bore as it does in a .300WM. In a larger bore, the volume for expansion of powder gases increases more rapidly as the bullet moves down the bore. That requires faster powders relative to a smaller bore with a similar case capacity. I have confirmed to my satisfaction that powders slower than H4350 actually reduce velocity in the 375 H&H during my tests with the 350g SMK, which included H4831. RL19 is in the same burn rate range as H4831 and highly unlikely to offer enough increase over H4831 to overcome the 100fps advantage of H4350 and the nearly 150fps advantage of RL17 in the H&H case. While it's true that there is room to increase case capacity to gain velocity, the point of my quest is to maximize the capabilities of the H&H. That is why I do not intend to go with the Weatherby chambering. My original goals are well within reach and have actually been exceeded. The real challenge for me now is finding the accuracy level necessary to make it all work at long range. I, too, am disappointed that Hornady has dropped the 300g BTSP. It was an excellent bullet. I am hopeful that Hornady intends to offer an improved bullet in its place in the near future. Will have to wait and see. If not, there are alternatives that will suit my purposes. The reason that I have been using the Hornady bullet to begin with is that my earlier testing confirmed very similar pressure and velocity behavior to the Cutting Edge 300g MTH, which is ultimately the bullet that I wish to use for long range. Because the MTH bullets cost $2+/bullet, I am doing the majority of my development with the much less expensive Hornady bullet, which will get me in the ballpark. I can then fine tune the MTH from there. That is the reason I have not worked with lighter bullets like the Accubond, though they have similar bc's and can be driven much faster. The Accubond has nowhere near the long range potential that the 300g and 320g MTH's do, and that is what I am ultimately chasing. [/QUOTE]
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.375 H&H 300g bullets best velocity
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