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I've used 250 grain bullets in the 8x56R. I resized them to .330 for my rifle. I used another approach on propellant selection. I used a full charge of slow burning propellant. My load was 45.0 grains of H-1000, which is very slow. The bullet was a 250 gr. Hornady round nose. The muzzle velocity was 1513. I think you could use a number of slow propellants to do the job, such as 4381 or even 4350 so long as you kept the charge up. Slow burning propellants have a slow burning curve that eases the bullet on its way instead of giving it a sharp slap like faster ones do. The slow (relatively) initial burn is what you want for getting that heavy slug going.

I'd be very careful about bullet size in relation to actual bore size in the rifle to be used with this one. The heavier the bullet, the higher the pressure will be if the bullet is too tight.

When you use a very heavy bullet in the 8x56R with the proper components, you're just doing the same thing they did with the original 8x50R which used a bullet of about 246 grains in weight. You're taking a step backward because the intent of the 8x56R was to get more velocity out of the cartridge with more modern components. I understand that you might want to use the 250 grain bullet for economic reasons, as that was my reason for doing so. The .338 bullet is not popular for reloading; most people who own .338 Mags are not target shooters and don't use up bullets very fast. Sometimes you can find deals on heavy .338 bullets and when we can pick them up for bargain prices, we can reconfigure them for use in 8x56R.

H-1000 is one of the slowest powders and doesn't have a lot of utility for most milsurp calibers. It was originally made up for long range shooting with .270 Winchester. When you are experimenting with heavy bullets, it's a safe play. It's another one of those things (like the .338 bullets) that if you get it for a good price, you can find uses for it.

Some of the cast bullet rifle shooters prefer max loads of slow propellants (as opposed to light charges of faster powders).

4350 (either one) would be okay for the 250 grain bullets, just be sure to use a full charge, something in the range of 45 to 50 grains for 8x56R.

Be careful when you are trying to relate 8x50R to 8x56R data as published on this side of the Atlantic Ocean. It may or may not be stated in a given reference what bullet size is being used. As we've discussed before, the 8x50R uses a .323 bullet that rides the lands in a .330 bore and seals on the base. If the American reference gives data, they may be using a .323 bullet (without the sealing base) and the pressure is going to be way down on those loads. There is plenty of gas leakage around the grooves when a .323 bullet without a sealing base is used in an 8x50R load. You lose about 75 to 100 fps between the .323 and the .330 bullet.

I'm not sure that I would use IMR 3031 with the 250 grain bullet sized to .330. I wouldn't know a starting point for the load. It's pretty easy to come up with a load using the slow propellants because even with a case-full of powder, you aren't in danger of an overload. With the slow powders the danger is more on the side of reduced charges. 3031 has been known to do strange things with reduced charges, so this is an unknown in experimenting with it using heavy bullets.