I am no bow techie, but I have used Muzzy 3 blade 100 grains for years and have never had a problems with penetration or pass-through. The last deer I shot with one was a large, mature doe. It was about 15 yards and a fairly steep angle. It came in a bit high, deflected down off a rib, grazed its heart, poked a hole through its breastbone and stuck in the ground on the other size. I shoot a Darton Storm set at about 58 lbs., so my bow isn’t the fastest, either, but it’s quiet and does the job well, IMO.