I own the following
(2) Kimber Select Classic - 257 Roberts
(1) Nosler Professional - 257 Roberts
(1) Winchester Custom built by Roger Ferrel
(1) Dakota model 97 - 257 Roberts Ack Imp
What I’ve found is that all of my rifles love a 115gr Nosler BT and H4350 powder. I also use a 110 AB if there is any chance that an elk might come into play.
Just hard to beat a 257 Bob!