: You're right, Bob - it was Brian. Thanks for the correction.
: As to loading the .45/70 to equal the .458 - of course that can't be done.
; In my rifles, the .45/70 has handled 40,000 to 43,000cup pressure levels just fine. I think it is definitely possible for a rifle to have what appears to be an oversize chamber - generally when chambered with a brand new reamer. The brass can only expand to the size of the chamber and there is no problem if this expansion is up to .008" from unfired dimensions. .008", while quite a bit, is still within specs for most factory rifles from Rem, Winchester, etc. I feel it's too much but they don't. This is why I like to have my own reamers made to my specs. Too, some sizer dies squeeze the brass down more than necessary, RCBS comes to mind, making the expansion look excessive as well.
; It is normal for any modern round to expand to the chamber size, then contract .001" to allow for extraction.
: I've a friend with a Marlin Stainless Guide Gun, that gets 400gr. Barnes FN's doing 2,007 fps with a load straight from Speer's book - 49gr. Re#7. I know these are supposed to be 34,000CUP or less loads, but his velocity is 150fps to 200fps higher than the book speeds and yet his barrel is 3 1/2" to 5 1/2" shorter(book uses 22" or 24"??). So - his barrel and bullet choice is developing greater pressure and thus higher velocities, but the pressure is still low enough to cause abslutely no signs of high pressure, whatsoever.