Metal doesn't just 'peel'. That'd be a huge issue for me too.
The issue with the Gunparts bolt head is that they don't mention any dimensions of 'em. Means you have to buy a fistful to try with a headspace gauge(you'll need a set, not just a No-Go or Field too) until you find one that is good. Just like a No. 1 Lee-Enfield.
I wouldn't 'work with some guy from E-Bay' either(aside from E-Bay being rabidly anti-firearm ownership). You need a smithy who knows Mosins. Dunno how prevalent those are, anywhere, never mind Texas.
Like mehavey says, excessive rim clearance cannot be solved in handloading. Needed to be bigger. snicker.