ICH why custom???? the 3 die set works good for me & I`m not useing the FCdie with cast.
snuffy , your rite on buddy it`s a nose pour,Lyman 429422 , I`ve seen a mold & it sorta looks like a slug mold for shotguns except smaller .
I wish I did have access to it, but I traded for a 358156 & the friend of mine sent a hand full in the box .