Try Superformance, with the 140 grain Accubonds, I got
3070 Fps average. Norma MRP got 3104Fps same bullet
and case but with CCI250 Mag primes. One load of RL26 went 3153 Fps with 140gr Accubonds and WLR primers and win cases.
These were shot at 70 to 80 degrees. I,ll back the RL26 load off to about 3125Fps next time.