So, for no particular reason other than it sounded fun, I decided to buy something capable of killing the largest critters on the planet. I've got a CZ 550 European-style (I like the stock better) chambered in .416 Rigby on the way. I really enjoy hand loading, and for this beast, ammo is about 80% less expensive. I'm finding lots of conflicting data on the Internet. I'm wondering about bullets and powders. I'll be using Federal 215M primers. The intended purpose is for this to be the go-to weapon for Cape buff and maybe someday an ele or two. For bullets, I'm leaning toward 400gr Barnes-X and 400gr Barnes solids for follow-up work and elephant. For most magnums, I use H-4831 or H-1000, but I'm off the map so to speak with this caliber. Anyone have a favorite powder for this? I'd like to end up at about 90-95% case density. Although I'm sure the CZ 550 would handle it, I'm not really interested in running up pressures too much. I'd like to end up in the 2,400 to 2,500 fps range.