Ok im gonna shoot magnus stinger buzzcut. what do you think i should shoot?

the only bad thing they say about it is sometimes the bleeder blade they get lose. and it only has a 7/8 in. cut and i don't want to wound any deer considering i only pull 40 pounds. im starting to think i should shoot muzzy 75 grain or spitfire 85 grain. btw the 85 grain spitfire is 1 1/4 in. cut. and the muzzy has a 1 and 1/ 8 i think. what do you think i should shoot?