Ive shot both mechanicle and fixed, killed deer with both, liked the wound channel the mech. made, pass-through shot two inches wide made a blood trail easy to follow at nite" looked like you painted a red line through the wood"s. I have gone back to muzzy since they came out with the mx4 100gr, a couple of places I hunt have hogs, dont really know how well the mechanicles will do on them as far as penetration, and Ive always had good luck makeing the muzzies fly well.