Thread: Looking for load data for 303 british

I have ordered some Hornaday (7.62 x 39 255 grn sub-X Projectiles ) they are measured at 0.3115 inch and i am wanting to try them in my 303 No4 Mk2, full wood, and a BSA P14 (straight bolt sporting rifle) both have brand new barrels and very tight head spacing. My pwoders are AR2206H, AR2209, H380, IMR4831, IMR4350 I have new Winchester and Bertrim Cases and 0nce fired PPU cases. I would like to know of a starting load, both barrels are 1:10 twist I am keen to see if they will stabilise in these rifles Have load data for 215 grns Cheers Gary