RE: best long range caliber
I'd take a serious look at Remington Model 700 Sendero chambered for the .300 Remington Ultra Mag. They have rounds loaded for the .300 RUM at three different performance levels The mild loads equate to a .30-06 level of performance. The mid-range rounds approximate the.300 Win Mag. And, the full power.300 RUM loads surpass the .300 Win Mag by a healthy margin. Pretty neat concept.