Ok guys: lets's get to serious stuff.
Has anyone tried to see if it will handle a 25/20 round. The length seems OK, but the bolt face might need to be slightly bushed, and the extractor built-up.
The next question would be the 256 winchester. My Hornady book says max COAL to be 1.775. I would think it to be the same as a 357 Mag round i.e. 1.590. Someone just posted above that the mag length is 1.650 max. Can we get a couple of dummies of these two rounds to someone with a rifle to give us some "on sight, in person" thoughts on these two grave matters to us tinkerers.
A bolt 25/20 would be neat, and feed anything. Probably the pointer the better. 357 cases are a dime a dozen, and any idiot with a 7/8x14 bolt, a lathe and a set of drills ought to be able to make an intermediate form die. It might take two dies, and an anneal after. Supposedly, 25/20 brass is very fragile. The 256 might be the best bet, and easiest?
Let us hear some thoughts!
Either of these might be better than doing a 25-222 Copperhead. Maybe?