Shot a doe with mx-4 last year, one lunged her , blood everywhere, she ran 50 yards. Any of you folks who have had blood trail issues with the old muzzy's will love these, huge hole, size of the bottom of a styrofoam cup. Also the old muzzy's 3 blade 100gr on a microcrometer only measured 7/8 cutting dia. The new ones MX series measure what they say them to be.