I am heavily into ACCURATE MOLDS for the .40, .45, .47, and .50 bores.
Very happy with all those.
I looked at their offerings for the .348 WCF and found they have 7 versions designed specifically for that chambering,
220-grains to 300-grains bullet weights in clip-on wheel weight alloy.
I'll get one or more of these when I get around to it, they all look good to me: