I came across one in a LGS recently. Since I traded off my trapdoor for a BRC in 40-65, I've really enjoyed everything about it. I didn't exactly jump all over this Krag chambering for a few reasons. Which brings us to the reason for this post. 
Does anyone have any information about the chambering in this rifle, ie: twist rate, designed for cast or jacketed bullets? 
Additionally, the rifle has scope blocks mounted, a rear tang sight base is installed, but no staff. Is there a way to determine scope choice based off of block spacing? I kind of like the idea of a .30 cal. in a highwall especially since it matches the original era of rifle/cartridge, so that's the pea what's been rattling around the tin pan I call my brain for the past week or so.

I've got a Shiloh that I picked up years ago at a LGS thinking of rebarrel  to 38/50 , but its so fun to shoot with smokless and  cast that its still stock except  that I cut the barrel down to 30 from 34" . I'm  sure its 10 twist and will handle all loads. Mine likes 311284, 210 grain lyman.

Whelen carried a HW in 30-40 He loved it. I've wanted one since reading his book Mr. Rifleman.

Back about 1984 or so I had a long discussion with Wolf Droege at the Virginia City Buffalo Runners shoot  about the possibilities of building the Sharps in 30-40 Krag.   At that time he said if I could show him an original in 30-40 Krag he would consider it.   Turned out on there was one, Freund modified, at the Roosevelt museum in Medora SD.  Next year at the shoot I told him all about it.  Three or four months later I had a call from him saying he would build a couple and see if they would sell.   My  Montana Rough rider in 30-40 Krag , half round/octagonal,  arrived the tail end of January 1986.   The price was $542.00 plus $11.00 for COD shipping!   Were those the "good old days?;"   and, only 3 or 4 months for delivery.   Obviously  the results of "testing the waters" turned out very well as the 30-40 Krag was listed in the next catalog as a standard caliber.   It is a tack driver with 180 grain jacketed bullets, but mostly I shoot a 190 grain gas check lead bullet.   I  doubt I'd ever part with it.

Having said all that,  I've always wanted a 30-40 original Highwall too as it could probably be built a pound lighter with a #3 barrel. 

George

It would make for a very nice hunting rifle all the way up to elk, moose and bear. But unfortunately my hunting days are over or I would be showing pictures of it as well.

Not being a "texter," would someone please clue me in to what the heck is an LGS?   Sounds like a good place to find nice rifles.

Thanks,
George

Yes, the LGSs were where the ODGs used to hang out.

A couple of things; I'd be willing bro bet good money it is a cast bullet gun. When Pope wanted a gun for hunting he ordered a High Wall in 30-40 from Winchester. In Pope's words you dont need a Pope barrel to kill a deer. Lastly if the blocks are 7.2" center to center virtually any externally adjustable scope will work. Again if I were a betting man i'd bet they were unertl blocks.

40 Rod