I love my muzzys. Both deer taken this year have had complete pass throughs. Im using 3 blade muzzy 100 grain broadheads, 30" easton carbon excel 340 arrows at 420 grains, tru-flight 4 inch helical feathers, Mathews Legacy, Bodoodle Pro lite. 70 pounds and 275 FPS and no tuning problems. Great broadheads.