Done the 100gr with pistol powder thing. Thinking of 145gr PB with 4227, Rx7, cfeblk or 1680, maybe 7-8gr for 1200 or so fps - NOT looking for subsonic. Low recoil plinking @ 50 or less. From AR pistol so would like the gas to work. So what powder ignites good and burns decent at this low case fill? Somebody with QL have ideas?