I've looked into one a couple times, as I have plenty of 6mm Rem, Brass
75-80 gr A-max at 3400-3500, make a very good long range rig, for smaller goats and deer (fallow deer) quite a lot of across gulley shoots, on slips, and faces on other side of creek, down hear in Taranaki, New Zealand,
I have often wondered how long barrel life would be 1000 rounds or so, at a guess,
Trouble is there is also, pigs, red deer and the odd scrub bull, round here, so I feel much better off, with the 7x57 or .260.