I’ve had great success hunting elk with a copper 92 backcountry in 300 win mag shooting TSX 180’s and worked up a very accurate 165 load for an upcoming AZ 12aw early rifle deer hunt. Talking to my guide he is strongly against the copper TSX and has advised me to work up a different load with a lead style bullet like a partition. The 165’s are coming out of the barrel at 3200 FPS so I feel like expansion should not be a problem...any thoughts?