Can anyone help me determine a load for cast boolits in the 303 Brit that will be just subsonic? The powders I have are H4227/AR2205, Lil'Gun, Varget/AR2208 and H4350/AR2209.
Boolit weights are 230gr and 208gr.
I would prefer a load that nearly fills the case if possible.
The 303 Brit has a case capacity similar to the Krag and 308 (when measured to base of the neck - where the boolits will be seated to).
Thanks