Posted: 3/31/2008 9:28:34 PM EDT
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Let me begin by saying I have a brand new HK USP 45 Tactical in hand and am about 4 weeks into the wait for my CFA supressor paperwork to come back. So... As I understand it, to maximize the effectiveness of the supressor (or minimize the noise, I guess), I want to use subsonic loads, in order to avoid the hypersonic crack as the bullet exceeds the sound barrier (roughly 1050 Feet/Sec). The supressor does the rest. A rudimentary search of the google found me a set of ballistics tables from Guns and Ammo. It indicates that basically anything with a bullet of 230 gr. or larger will not reach over 1000 fps. So unlike 9mm or .40, it really doesn't matter what I shoot, because its basically ALL subsonic ammo (less the +p or really tiny bullet loads). Does this sound right or am I missing something? I'd like to start stockpiling for the next Idaho trip... |
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A .45 ACP may be Supersonic, but it will never be Hypersonic! Speed sound varies by the Temperature. At 70° F. it is about 1129 fps. Hypersonic is 5 times the speed of sound or greater – about 5645 fps @ 70° F. So only the 185gr and maybe a 200gr on a cold day will go Supersonic and then only hot loadings. (185gr is a common weight for a target load) |
