![]() ![]() ![]() Shop today at your online source for subsonic ammunition, Palmetto State Armory. This gives the 5.56 a shorter distance between the place where the rifling engages the round and the cartridge. Both are similar in size, but a 5.56 cartridge has a slightly longer leade. We stock a variety of calibers from subsonic. 223 and 5.56 are the sizes of the cartridge and the amount of pressure generated by each. I agree that the 22lr makes a much better subsonic platform for plinking, but it's nice to have a subsonic load for any suppressed rifle. The advantage of subsonic rounds is noise reduction when paired with a suppressed firearm. Come with as I shoot my first down loaded 243 rounds attempting to drop below the speed of sound and see if it retains accuracy and consistency. I have used the Hodgdon recipe with a 55 grain bullet and trail boss (I believe 4 grains).
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