Best overall caliber for long range shooting

I just inspected my 6.5 PRC barrel and its showing more wear than i expected at 800 rounds. Im debating about pulling it this winter and going 7 SAUM or 300 WSM.

ive been running one 300 wsm or another for some time. The 215 bergers out of my 9” twist30” long Krieger 4 groove are hell on steel plates and deer. the latest 300wsm was built on a defiance deviant med action. I wish I had built it on a long action but I may do that my next go around.
 
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