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+---- Thread: Winchester Highwall 40-70 SS Chambering Problem (/thread-2503.html)
Winchester Highwall 40-70 SS Chambering Problem - John - 03-13-2018
I have a original Highwall in 40-70 SS that I’m having a problem with. A sized case will not fit in the chamber. It binds with about 3/16 ish sticking out. Just using a sized case now, not loaded. I’ve lowered the die and am getting cam over. Cleaned chamber.
Brass - Bertram
Dies - Lyman for original chamber
Ideas? Thanks for your help.
RE: Winchester Highwall 40-70 SS Chambering Problem - Don McDowell - 03-13-2018
That Bertram brass might be to thick at the web.
If you can get ahold of a 30-40 Krag brass might see if it will drop in, then you could exand the case and fire form.
RE: Winchester Highwall 40-70 SS Chambering Problem - Kurt - 03-13-2018
John with out looking it up but I think the original .40-70 took something like a .403 or a .405 bullet. This would make the case neck tighter then the .40-70 now uses.
RE: Winchester Highwall 40-70 SS Chambering Problem - John - 03-13-2018
(03-13-2018, 08:52 PM)Don McDowell Wrote: That Bertram brass might be to thick at the web.
If you can get ahold of a 30-40 Krag brass might see if it will drop in, then you could exand the case and fire form.
I found some Krag brass and it worked fine. Looks like it will be shorter than 2.5”. When forming does it stretch or does it need to be streched?
RE: Winchester Highwall 40-70 SS Chambering Problem - Don McDowell - 03-13-2018
It will stretch a little, but may need to still be stretched. But unless you're shooting patched bullets I don't think the little bit the case will be short to be a problem.
Buffalo Arms sells 30-40 brass formed to 40-70.
RE: Winchester Highwall 40-70 SS Chambering Problem - bryany - 04-05-2018
(03-13-2018, 11:09 PM)Don McDowell Wrote: It will stretch a little, but may need to still be stretched. But unless you're shooting patched bullets I don't think the little bit the case will be short to be a problem.
Buffalo Arms sells 30-40 brass formed to 40-70.
Most of the 40-70 SS brass I have used required sizing of the bottom quarter of the case smaller than the FL die could do. I cut down a FL die so I could run the case all the way to the rim. That made them chamber just fine. Subsequent loadings have not needed this step.
I cut the bottom 1/8-1/4 inch off and then cut most of the top half off. A good machinist could probably make a sizing die but it was easier for me to ruin a FL die.
Bryan
RE: Winchester Highwall 40-70 SS Chambering Problem - Don McDowell - 04-05-2018
I'm just hoping this supply of JBA brass I have will work just fine whenever my 77 from Shiloh gets done. These rcbs dies I have size the brass down far enough they just flop right into the chamber on the hepburn.
RE: Winchester Highwall 40-70 SS Chambering Problem - Randy Bohannon - 04-05-2018
Redding dies over work my brass for the Shiloh 40-70,might be a good option for an original chamber,exspensive option for sure. RCBS seems perfect barely sizes fired brass.