Is this a reasonable or idiotic assumption for working up safe loads in 7x65R?
So, I've recently come into possession of a post WW2 made 7x65R falling block, and of course I bought a few boxes of factory ammo as deer season starts soon down here. I've also bought a good supply of brass, already have 7mm bullets, and the bore slugs properly for 0.284. Theres plenty of load data out there for the 7X65R with various powders, Norma 204, IMR 4831 etc.
Heres where your opportunity to let me have it comes in. Like a lot of members here I have an ample supply of IMR 4895 powder for the Cal. 30 milsurps. I'd like to use some up in loads for this cartridge. Norma 204 has loads for both 30-06 and 7x65R. Can I assume the same charge weight differential will allow me to calculate a safe load of 4895 in the 7X65R, taking into account case capacity (including final bullet seating depth)?
OK...roast me.