Not a 223 rem, but figured I'd link my 22cm experience. Also, when I was removing one of the shoulders, I made some wrong cuts, encountering resistance, realized I was cutting through the top of the scapula, good thing my knife is a magnum or it would have bounced off.
Shot a bull elk tuesday morning. 88gr ELD-m, 2860 at the muzzle. 489 yards, broadside. Shot him twice, he managed turned himself around, I considered sending a third round, but he collapsed right as I decided he didn't need it. He made it maybe 3 yards from where he stood when I shot, and that was mostly gravity. Onside shoulder a little bloodshot, but not too bad. Offside shoulder was clean, never found any fragments or jacket. Didn't dig too deep, he died on a south face in the sun, so I was in a bit of a hurry.
Tikka stainless with a Preferred prefit, in a Stockys VG, NF Atacr 4-16 Mil C. Tripod set up just high enough to clear the brush.
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