IMR 4831 in 500 s&w magnum

[megasupermagnum]

I've tried all the 4831 that would fit in a 308 Winchester case, and even in that big case, the stuff barely burned. It left enough kernels that had to be shaken out of the chamber, else I couldn't chamber a round. I don't think you could find a worse powder for 500 s&w, other than maybe a 50 BMG powder.

[35remington]

Even with the muzzle pointed up the large amount of granules left unburned have a tendency to nest under the rather large extractor star present on a 500. In my opinion if you cannot find a use for 4831 in a suitable rifle caliber trade it for something better suited to the 500. To waste it in this way and put up with lots of unburned powder and with underwhelming performance sounds like a lose lose proposition to me.

[lar45]

FWIW
Quickload estimation is under 800 fps with a compressed load.

We used to have guys loading WC872 in the 45-70. They'd have lots of unburnt powder, but it was cheap.

If your Smith has the muzzle brake, expect some of the powder to be ejected out of the ports.