In reply to:

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Pottsy,

I would bet you could go higher pressure & velocity if you got your hands on an 1886 Winchester, especially if a modern one. One gunsmith years ago actually chambered an 1886 in .300 Winchester Magnum and used it as a single shot to see how much pressure the action could handle. The action did fine with no wear with any load that could be crammed into the .300 Win. Mag. case. The action the smith used was an old 1886, I think 1920's or 1930's vintage.

Richard.

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I don't have to push the one i have to get a good load out of it .
And if i really wanted to stand on it ( god know's why ? )
I would go a BLR 55.000 PSI mag action
but there is no need to do that

The load in question is a compressed load at 40.000 PSI
to start with going to a diffrent rifle would not do anything anyway there just is not any room in the case for
more powder.

I mean why not brake out my M77 Ruger 458 Mag
or my BLR 50-110 .

The 45-70 is what it is and in a GS it's one of the best brush guns i have ever pack out
and in a Cowboy its a hell of a close range Elk and Brown Bear rifle.
And at an easy 40.000 PSI and a 500 grain bullet at 2100FPS
in the cowboy 26 inch barrel 45/70
the next closet rifle is my Ruger 458 at about the same bullistic preformance level.

My 45/70 is not a 458 win mag and my 458 win mag is not
a 45/70 although thay are neck and neck when it comes down! to necks on DG i will be using my 458 win mag thank you

The only real compation for the 45/70 in a GS is a BLR convertion from a 300 win mag to a 50-110 brush gun.

It's beat me packing that 10 ton 10 Ga S/S i used to pack in the brush for Brown Bear.