In this instance, heavier bullets are loaded in standard ammunition, which reduces muzzle velocity below the speed of sound.Īs an example, the very common 9×19mm Parabellum standard military round is a 7.5 grams (116 gr) bullet at velocities typically around 360 metres per second (1,200 ft/s). Standard calibers Subsonic versions of standard rounds Some subsonic ammunition is used in non-suppressed firearms to gain the advantages of heavier bullet weights. Subsonic ammunition usually uses heavier bullets to retain as much energy as possible at the lower velocities. This avoids the supersonic shockwave or "crack" of a supersonic bullet, which, particularly for suppressed firearms, influences the loudness of the shot. Subsonic ammunitions are ammunitions designed to operate at velocities below the speed of sound, which at standard conditions is 340.29 m/s (1,116.4 ft/s) or Mach 1. I might even have to break down some handloads to get a little to try.Ammunition designed to operate at velocities below the speed of sound Turned out I'd forgotten to resupply after using up my last batch, and of course right now there's none to be found. Recently started an article on a certain cartridge, and discovered H322 would be a good one to try. It's the only way I can continue to experiment with different powders for various articles-and the reason I keep a running inventory of my supplies on my computer.īut even then I sometimes get caught short. Right now I have close to 100 smokeless powders on hand, because during the last "shortage" I often couldn't get powders (or bullets) from manufacturers, because everything they made was going out the door as soon as it got packaged. But that's another subject.)Īll of this is why a lot of handloaders keep a wide variety of powders. (I also believe this present shortage is being compounded by people who realized, due to previous shortages, that they could make "extra money" by reselling components. I do believe the "shortage" is already starting to wane-they always do, though sometimes it takes a year or even two to fill up the supply-line completely. 350-but the problem today is, of course, finding any. One of the best-known today is Trail Boss, which would probably work very well for reduced loads in the. IMR4759 was one, but IMR4227 also works well in certain loads. 45-70 to duplicate its original black powder velocities.Īll which is why we do have some powders designed specifically for lower-pressure handloads that burn more completely. But as I already noted, IMR4895 will leave unburned kernels when used in the. They burned a bunch of "war-surplus" IMR4895, and it did work better at what many would consider slightly under maximum velocities in various cartridges. But I believe that's also the reason so many handloaders who started during the post-WWII era tended to believe that loads slightly under maximum would be more accurate. IMR4895 is a classic example: It was originally sort of co-designed with the M1 Garand to burn best at around 50,000 PSI, because that was better for the M1's gas system. ALL can leave unburned granules when used in reduced loads, because they're designed to burn best at higher pressures. 308 as a full-power powder-but so do H4895, IMR4895, and a bunch of other powders of about the same burn-rate. I have mentioned here and there that 5744 works well in the.
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