In reading a bit about powder for subsonic pistol loads it would seem that most are using powders that enjoy a faster burning rate. So - does one want a faster burn rate? Is there a point of diminishing returns?
Re: Powder for Sub Sonic Pistol Loads? 9mm & .45 ACP
N320 is awsome in 40 also, and the brass hardly needs any cleaning, stick with the heavies, 147 in 9, 180 in 40, and 230 in 45 and enjoy soft shooting suppressed good times.