Thread: 223 sub sonic loads

Accuracy may not be what you hoped for, if you achieve subsonic speeds there will probably be a lot of unburnt powder left with 2206 or any other slow powder. My experience with this in a 3030 using cast bullets was velocity was inconsistent, and the amount of unburnt powder varied between shots resulting in poor accuracy. I switched to trail boss and then Hercules blue dot and am getting 11/2 inch groups at 100 yds.
Jacketed bullets offer more resistance than cast ones and that may increase the pressure to a point where the powder burns better. Also if the pressure is to low they may not engrave properly.
I have read old reports of damage caused by reduced loads of slow powders but cant remember the details. There are a number of reloading forums that could point you in the right direction, one that comes to mind is The High Road