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The Range
Ammo & Reloading
.45 ACP and Pressures
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<blockquote data-quote="NikatKimber" data-source="post: 803559" data-attributes="member: 423"><p>The difference is that those numbers are max pressure. So Tech99 is right. If the TG or Unique had the higher pressure the whole time (or at least close to the max pressure), then it would yield higher velocities. But as a fast burning powder, it hits that max pressure quickly, then drops off. Where the slower burning powder may have a lower max pressure, it will stay closer to that max pressure for a longer period of time, yielding a higher final velocity. This is probably why some comment that while the .45 has more recoil, it is more of a push, rather than the snap of the 9mm or .40 S&W.</p><p></p><p>They would do best in different applications. The slower burning H110 will not be as ideal for a short barreled gun. So if you're shooting say .357, and have two guns, one a 2.5" model 19, and the other is a 8 3/8" model 686, the H110 will far outshine the Unique in the 686, where in the shorter barrel, there will be much less difference, if the H110 is even better at all. That's where the chrono would help to tune your loads.</p></blockquote><p></p>
[QUOTE="NikatKimber, post: 803559, member: 423"] The difference is that those numbers are max pressure. So Tech99 is right. If the TG or Unique had the higher pressure the whole time (or at least close to the max pressure), then it would yield higher velocities. But as a fast burning powder, it hits that max pressure quickly, then drops off. Where the slower burning powder may have a lower max pressure, it will stay closer to that max pressure for a longer period of time, yielding a higher final velocity. This is probably why some comment that while the .45 has more recoil, it is more of a push, rather than the snap of the 9mm or .40 S&W. They would do best in different applications. The slower burning H110 will not be as ideal for a short barreled gun. So if you're shooting say .357, and have two guns, one a 2.5" model 19, and the other is a 8 3/8" model 686, the H110 will far outshine the Unique in the 686, where in the shorter barrel, there will be much less difference, if the H110 is even better at all. That's where the chrono would help to tune your loads. [/QUOTE]
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