The slower powders work better with heavy bullets for me in the 257 Roberts.. 48gr of RL26 with WLRM primers and win cases gets about 3120fps for 5 shots using 115gr Nosler partitions.
RL23 with 48.2gr with 110gr Accubonds CCI250 mag primers win cases 3157 fps. All in a model 70 Winchester. MRP,and RL22 gave similar performance. My rifle like 115gr Partitions
so that's what I shoot most of the time.
Just worked up to your RL26 load in my new Kimber Montana. Interesting that in my rifle only got average velocity of 2890fps using Remington Brass and CCI 200 primers. Wonder if your Winchester brass is +P?
On the other hand, Mule Deer's load of 100gr. BT and 48 grs. H4350 yielded 3200fps. This from his "Gun Gack" book.
