+1 for Retumbo, using 92.4 grains in my custom with a 28inch Broughton 5c barrel, shooting 200 grain Accubonds getting 3200 fps and 3/8 group at 200 yard.. Loving the 300 RUM!!!!
I ended up backing off more than a full grain due to temp sensitivity in 33. When it's a cool spring day, my max load is 102.3. When the sun is out, no way can I shoot 102.3. It went down 101.3 to be safe. 33 is a unbelievable powder, but it does have its draw backs. Temp being the major one. Here's a thread that can give you lots of examples of this.
