I shoot an Optima and find that 90 grains of loose powder gives me the best accuracy. For fun, I tried the 150 grains. Lots of recoil and so so accuracy. I like shockwaves in my Optima. I personally shoot the .40 caliber 200 grains shockwave with the blue 40/50 sabot. Amazing accuracy. And other members I trust said it is a deer killer. I never personally had the pleasure yet.