Savage_99,yeah the recoil of a .458 Win mag is a huge factor,if I get one I'm going to use either a 350/400 gr Speers loaded to about 2200 +/- fps. Did not realize the Pre '64 Varminter was heavy,but my .22-6mm is kissin' up to 11 lbs (with bi-pod) and Mister that gets HEAVY after a half day of callin' coyotes!
Kitch,all I can say is WOW!