Doing load development and need max load for 300 Weatherby using Retumbo Powder on 180gr for both Accubond and BTip's. Using Weatherby cases in a Weatherby Mark V.
I tried doing research here and LRH, as well as Nosler and Hodgdon Manual with only one post claiming 88.0 grain load(not referenced as max).
It seems that H1000 and RL22 are favorites, and are powders I have, so will start with about 1.50 grains below max on those(87.0gr and 79.0gr respectively). I also have RL19, and IMR 4350 and 4831 but research says to try these if slower powders don't produce. I was suprised not to find more references to the use of Retumbo, though Hodgdon does list a max load of 84.5g for 200 gr bullets so maybe the bullet choice is relatively light.
Any help on Retumbo load would be helpful.
