I think I have the screw issue sorted out now. I figure I may as well ask one more question about the buttstock. My other, "standard" stock's buttplate is too small to cover the end of the stock perfectly. You can see that 'ledge' it leaves all the way around, especially around the top half. Plus, I don't think the screw holes match up 100%, thought I managed to get it installed.

From what I was able to determine, there is only one size of buttplate; no such thing as a "Large" version. I'm not sure how the armorers dealt with large/long stocks, but I was just thinking I'd kind of give that wood edge a bevel, or maybe a bit of a radius and call it good. It's perfectly functional in this state. Looks a little odd maybe, but after all, it's just an old army rifle.

I figure I would run this buy you good folks. I'm curious if anyone else has dealt this this situation.