my take on it......sometimes when you are pushing ranges SHIT HAPPENS,you now know from hard experience to reload and be ready to shoot again if needed,sounds to me like you hit "the void" area......eg just above vital bits and just below spine.... well documented fail spot.... sometimes deer goes down like hit by lightening due to shock hitting spine but gets up and buggers off again in about a minute or less..... as for the recovered projectile.......it was 500 mtrs away so you got to expect it to be loosing some expansion...if as I suspect you sailed on through void on what was a light animal to begin with you cant expect projectile to do anymore than it did....to put it another way it encountered about same resistance as going through a hare or rabbit....if it had expanded MORE then if you had hit bigger animal it would blow up on shoulder and not penertrate. hells bells most fellas would be happy with that sort of expansion and weight retention at 50 yards. dont kick your self too hard ,just learn from it and shift point of aim forwards a bit maybe..... said it before and will say it again...take out the front wheels and they aint going anywhere....
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