Congrats on the buck, sounds like you put a great shot on him! Of course you can't expect a complete passthru if ya hit the off-side shoulder, but that's a lethal hit everytime! I gotta hunch....at the hit did he kick his back legs up like a rodeo bronc? - Man I love when they do that!!
As foryour arrow penetration, something odd is going on there. [:-]55#should beplenty for passthrus on deer, especiallywith 15yd broadside shots &sharp 2 blade brd-hds. How clean is your arrow flight? Have you bareshaft tuned your rig? Getting a good full draw?