ar15 forum states: 21 gr of H4895 cycles fine with a 40 grain bullet.
https://www.ar15.com/forums/armory/Looking-for-a-slow-40gr-223-load-update-H4895-looking-good/42-481900/
Shotgun/pistol powder in a rife? Your just looking for trouble. Titegroup is fast burning, where rifle powder is slower. About the only powder I now of that lets you load light loads is 4895. Max loads can be reduced up to 60 percent for load developement. 62 GR bullets max load is 23 gr of...