i bought a lot of 63 cheeks, 22 cal bullets and am shooting them in a 12 tw 22 BR that shot berger 64s quite well. a 22 BR is forgiving in that it can shoot small holes with a variety of powders. what powders have worked for you 22 BR shooters? i got stuck shooting slower ( n140 n540) powders but suspect faster powders might perform better. thanks.