I built a 400/375 belted Nitro awhile back ( yeah, I'm nuts) Now that my jacketed data is mostly done I'd like to find a load for some 350 grn cast bullets I have.
The case has 52 grns of water capacity to the base of the bullet, 24" barrel, not sure what else is needed to figure powder types??
thanks for any help you guys might have.

Here's one online:

http://kwk.us/powley.html