Quote:
Originally Posted by steelslaver
[...] I figure to blow up the huge throat cylinder just to see what it takes.
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You'd get the most useful information by very gradually increasing your preferred heavy load until you see the first dimpling over the back side of the cylinder stop notches.
I made my 25-3 group by loading castings from my lightest .45-70 mold. You could use that as an excuse to get out of the shop for an afternoon.