Looking to purchase new or build a long range rifle (1200 yards or so) for ringing steel or other target (no hunting). Looking at cartridge choice. 6.5 x 47 Lapua (I have 200 unfired cases), or 6mm GT. Hard choice, so welcome opinions. I do not compete, this is just for personal pleasure. If I can avoid a muzzle brake, that would be nice, but not essential. I reload. Top accuracy is a must, but would like 1500+ rounds barrel life minimum, not fussy on loads. I do not fire long rapid strings. Factory ammo unimportant. Reliable mag feeding a must. Prefer AICS mags. I can get a MasterPiece PMR in both calibers, a Seekins HIT rifle in 6 GT, and can get either with an Origin action and different shouldered prefits. If anyone has experience with one or both of these rounds, would welcome your thoughts on either or both for my shooting.