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Stubby--Lapua
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<blockquote data-quote="Fiftydriver" data-source="post: 158244" data-attributes="member: 10"><p>That was the whole point of my original point, if you take two rounds with the same powder capacity but with different bore diameters, the larger bore diameter will always produce higher velocity potential with the same bullet weights used in both rounds.</p><p></p><p>In my original comparision between the 300 WSM and 338 WSM, the 180 gr Ballistic Tip does have a shorter baring surface length then the 180 gr 30 cal Ballistic Tip.</p><p></p><p>Appropriate powders for the 300 WSM are in the class of Rl-22 and H-4831 with this bullet weight, with the 338 WSM and the same bullet weight the best powder I have found is Rl-15.</p><p></p><p>Because the larger more diameters can use faster powders they are less dependant on barrel length to reach their peak performance.</p><p></p><p>Not sure what point your trying to make here. Its common knowledge that a larger bore diameter will drive same weight bullets faster then smaller diameter bullets of the same weight.</p><p></p><p>As far as your comments about this is because there is more area for the pressure to push against I am not sure I agree with that. My reasoning there was that if you take same sectional density bullets over the same case capacity, you will get nearly identical velocity.</p><p></p><p>As you say, comparing a 180 gr 30 cal to a 180 gr 338 is like apples to oranges but when you compare apples to apples with bullets with the same sectional density, velocity is nearly identical or at least extremely similiar within the variations of each given system the rounds are fired in..</p><p></p><p>I personally do not thing bullet base diameter as a thing to do with it to be honest. I simply believe that the shorter, larger diameter bullet is easier to push down the barrel and because the expansion ratio is so much higher the use of faster burning powders promotes higher velocity potential in shorter barrels.</p><p></p><p>I apologize if my last post was confusing, I did not read it to be that way when I reviewed it.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 158244, member: 10"] That was the whole point of my original point, if you take two rounds with the same powder capacity but with different bore diameters, the larger bore diameter will always produce higher velocity potential with the same bullet weights used in both rounds. In my original comparision between the 300 WSM and 338 WSM, the 180 gr Ballistic Tip does have a shorter baring surface length then the 180 gr 30 cal Ballistic Tip. Appropriate powders for the 300 WSM are in the class of Rl-22 and H-4831 with this bullet weight, with the 338 WSM and the same bullet weight the best powder I have found is Rl-15. Because the larger more diameters can use faster powders they are less dependant on barrel length to reach their peak performance. Not sure what point your trying to make here. Its common knowledge that a larger bore diameter will drive same weight bullets faster then smaller diameter bullets of the same weight. As far as your comments about this is because there is more area for the pressure to push against I am not sure I agree with that. My reasoning there was that if you take same sectional density bullets over the same case capacity, you will get nearly identical velocity. As you say, comparing a 180 gr 30 cal to a 180 gr 338 is like apples to oranges but when you compare apples to apples with bullets with the same sectional density, velocity is nearly identical or at least extremely similiar within the variations of each given system the rounds are fired in.. I personally do not thing bullet base diameter as a thing to do with it to be honest. I simply believe that the shorter, larger diameter bullet is easier to push down the barrel and because the expansion ratio is so much higher the use of faster burning powders promotes higher velocity potential in shorter barrels. I apologize if my last post was confusing, I did not read it to be that way when I reviewed it. Kirby Allen(50) [/QUOTE]
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