I would like to reiterate my point that old dirty ass BL-C(2) is not what's responsible for making that ammo gel well with your rifles. The same as your car will run fine on petrol from Z and NPD, you don't have to keep going to BP out of superstition.
You can use something that doesn't burn like coal at low pressures, isn't known for being highly temperature sensitive, and is perhaps cheaper.
Unless you have a stash of genuine MkVII 174gr flat based spitzers + original primers and brass, you are not duplicating the load anyway.
E.g. I made some 7.5x55 ammo for a K31 and the goal was to emulate GP11. I used a 175gr SMK and StaBall Match, worked it up to the same ~2560fps and it shot bloody great.
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