Its quite simple to handload 223 subsonic ammo -using 55 grain bullets and pistol powder-but you would probably be better served with a 22 lr. Obviously this will reduce POI but for arguments sake how worthwhile/feasible is it? I load a 57 gr Hard cast, gas check bullet at 2500 and it will cycle reliably. To load subsonic (under 1100 fps) you will be hard pressed to get enough gas to cycle the action. Even then, with low velocity, you may still get key holes 100. My question is could one(me), "modify" a bullet(calculating speed of sound vs relevent ballistic info) to make it sub-sonic? I mean like effectively I am keeping the same bullet, primer, case(padding with cotton on primer side according to ) and am just reducing the amount of charge. You will need a fast twist barrel (1/7) to have any hopes of stabilization. Now according to wiki, the speed of sound is 1130 fps, so roughly 1/3 the speed of the bullet in question. Tis kind of a hand-loading question(sort of) but for arguments sake a 55g spitzer has a muzzle velocity of 3240fps. 223 rounds available(imported) but it did get me thinking. Now after a quick google, there ARE sub-sonic. Specifications and Features: Thermold AR-15 Stripper Clip. Can also be used as an emergency fuel source to start a fire. 223/5.56 and can be used with Thermold's AR-15 magazine loader (not included). Fair enough, as as pretty much all rounds available(easily/locally) are supersonic anyway. This stripper loader from Thermold is made of Zytel, a durable nylon polymer resin.
Thermold subsonic 223 full#
223 available in Ireland for full effect anyway. 223 is pointless as it makes no discernible difference in dB's, and no sub-sonic.
![thermold subsonic 223 thermold subsonic 223](https://gunstuff.tv/wp-content/uploads/2020/03/57870_A-600x929.jpg)
This might be a bit long-winded cos am new to the sport so please forgive any stupidities.