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Pressure, powder and caliber.

Kalkyl

Plastic
Joined
Sep 10, 2020
Max Chamber Pressure - SAAMI Specs

According to this tabel a .22 short produce higher pressure than a .45 long colt (original black powder load). But why? A .22 short propells a 29 grain bullet with less powder compared to a .45 long colt - that propells a 250 grain bullet.
 
A .22 Short produces its pressure for a very short time so it needs to be high to accelerate the small diameter bullet. The .45 has more than 4 times the area for the powder to work on while pushing it down the barrel.
 








 
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