For molds, I started with a very old Ideal 350293 designed for the .351's predecessor, the .35 WSL. Using it and plain based gas checks worked. Initially, I did my loading with a set of .357 magnum and .38 Super dies.
I've since obtained a set of real .351 dies. I haven't worked with it much yet, but got a 350447 light weight mold for the .348 Winchester which drops right at .352. That bullet has a flat nose and a real gas check shank and my early working with it suggests it is a lot better choice. It's a little heavy, so I dropped the Lyman starting data for 4227 by about two grains and it functioned the rifle and shot well. When/if I ever hunt with this rifle again, this is the bullet I'll likely use.
There are several guys who have sized standard .38 bullets to .352 and used them, both cast and jacketed.
This is a thread I posted about my experiences with it and a lot of guys contributed some very interesting experiences as well. http://castboolits.gunloads.com/show...317823-351-wsl