Back in 99 I harvested an antelope in WY with my .58 underhammer and a RB. The shot was 155 yards, 7 witnesses to the shot. At the time I had a Lyman #17 aperture front sight using the very fine post and ball. I still use a modified Redfeild Peep on the receiver. My load Cronoed @ 1750 FPS The way I was sighted I held 4" over his shoulder and took his pulmenary pumper out of business. The fellow that owned the land Shouted " You Hit him, I saw the Sxxt come right out the other side", he was referring to the blood spray.
Long live the RB,
Ken