That Jeffery double has been fed a steady diet of 400gr Woodleigh RNSNs the whole time its been in my care.
The only variation is .411 (which I prefer) or .410 meant for the Ruger No.1. The latter are indistinguishable from the former on paper and in the hunting field, so can't really explain the preference as I don't crimp this cartridge.
Ah, almost forgot, when I first acquired the rifle, Vic P_ gave me an ice-cream bucket of pre-Weldcore Woodleighs to burn through, and plenty of buffalo and boars couldn't tell the difference!

The only bullets I cast myself these days are for the Paradox.