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Good idea.

I can contribute on a Rodda .577/.500 No.2 Cordite Express.

Even have an original Rodda-headstamped cartridge, but paper-patched lead bullet so probably black powder.

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Although chambered for the .577/.500 No.2 Black Powder Express, the action flats are stamped “CO EX” indicating that the rifle was proved for, and probably regulated with, the cordite express ‘nitro-for-black’ load. Ballistics at the time specified a 440-grain .510 bluff-nose jacketed soft-point at 1675 fps, for 2740 ftlbs muzzle energy. The Taylor Knock-Out value would be 53.7 with a 440gr solid, not brilliant by any means, but some 25% more than the .375 H&H Magnum.

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I was going to ask regarding typical bullet weight, ballistics etc. I see Marrakai has provided some data.

So a NFB type load might get around 1600 to 1700 fps.

What would a BP load get typically?

The Woodleigh Weldcore bullet is 440 grs. Is this typical for a ,500 EXP? Any difference weights, lead bullet wrights?

Different .500 EXPs might have different case capacities? What sort of variations in bullet weight, velocities etc?

Just out of interest. Thanks,