So I just bought some CCI quiet and really enjoy them out of my Marlin 39A in my backyard 1 acre rural subdivision. I also have a Colt/sako 223 bolt action that I an shooting a load of unique and lymans 225415 at about 2200 FPS for fun. Now if I could with that bullet and no gas check simulate the CCI quiet load (700 FPS) in my back yard, that would be sweet. If this is the wrong section, then move it but I would think other here would like to quiet plink with their 223 rifles as well. As of now, I read someone use 3.5 grains 231 to simulate 22 LR but I would want subsonic. I could see that a fast powder would maybe make less noise in a rifle as it would be long burned up when the bullet leaves the barrel. thoughts? and thanks ahead of time.