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The Range
Ammo & Reloading
.45 ACP and Pressures
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<blockquote data-quote="technetium-99m" data-source="post: 803366" data-attributes="member: 3615"><p>But how much does recoil really have to do with pressure?</p><p></p><p>Take standard 9mm and 45acp. More pressue in the 9mm but more recoil in 45. </p><p></p><p>Take 44 mag. Look at Unique and H-110, my Lyman manual lists max pressure at 39,000 for Unique and 38,800 for H-110. Yet the load with H-110 lists velocity at 1271 while the Unique load gives 1074. I have played with both these powders and can tell you the max H-110 load develops more recoil with less pressure.</p><p></p><p>Maybe I'm not thinking about recoil in the right way, but in a 1911 the gun really isn't going to unlock and start extraction until the pressure in the case/barrel is equal to atmospheric. While the bullet is in the barrel the barrel is actually going to be shoved forward into the upper lugs away from the breechface, I don't think the gun can even unlock while you still have the pressure of the cartridge present.</p><p></p><p>Now in a gas operated firearm, yes, pressure is everything for function.</p></blockquote><p></p>
[QUOTE="technetium-99m, post: 803366, member: 3615"] But how much does recoil really have to do with pressure? Take standard 9mm and 45acp. More pressue in the 9mm but more recoil in 45. Take 44 mag. Look at Unique and H-110, my Lyman manual lists max pressure at 39,000 for Unique and 38,800 for H-110. Yet the load with H-110 lists velocity at 1271 while the Unique load gives 1074. I have played with both these powders and can tell you the max H-110 load develops more recoil with less pressure. Maybe I'm not thinking about recoil in the right way, but in a 1911 the gun really isn't going to unlock and start extraction until the pressure in the case/barrel is equal to atmospheric. While the bullet is in the barrel the barrel is actually going to be shoved forward into the upper lugs away from the breechface, I don't think the gun can even unlock while you still have the pressure of the cartridge present. Now in a gas operated firearm, yes, pressure is everything for function. [/QUOTE]
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