That strongly suggests a coiled case chamber as they had a separate case head attached to a coiled brass case body similar to a shotgun shell. There was a taper from the base forward and then a mostly straight case to the mouth for the coiled portion. Like the ones on the left in the picture...
Hmm. They were cut to length, sized in a 3" 500 Nitro Express die and annealed. It might be the diameter at the mouth of the case is too large as they are 2.510" and the NE die isn't sizing them down far enough. Try this: take a sharpie and color the entire case and try again. The scuff...
The rimmed part puzzles me - it would've been a questionable effort to make a rimmed cartridge work in a magazine Mauser. Perhaps the bolt face was opened up but not for a rimmed cartridge? Throwing darts in the dark,
Just a wild guess, based on the given numbers and rimmed information - the only thing I can think of would be a faint marking of "7.7x56R", which is 303 British. Not worth much as a guess - only a chamber cast and bore slug will reveal the truth.
Edit: Looked at the pictures and noticed the...
Steeple rounds - what are those?
Over time, accumulating dies and other tooling usually saves you anguish at some point! All that stuff accommodates lots of variations...
Assuming the rim depth is a typo and should be .065", that is a bit deeper than mine (.047"). Not unusual. If using modern brass with thinner rims, there are ways of making the headspace work.
If the chambering is original, it is likely one of the many 500bpe iterations. My rifle measures...
On the subject of headspacing - a great many milsurps will accept a NO-GO gauge. Some are not aware there are three gauges; GO, NO-GO, and FIELD. The first two are used to determine the chamber and ensure factory ammo will work. The FIELD is longer, and it represents the point where it should...
The standard barleycorn front sight is miserable for accurate shooting at range. Sights like the 1903 (or A3) Springfield, M1917, K31, etc. will spoil you.
The Turk surplus is to be avoided, as mentioned. Erratic and high pressure with cracked necks from seating bullets in brittle cases. I...
Just about any of the high end late Victorian era British rifles - Holland & Holland, Rigby, Westley Richards, etc. Singles, doubles, and bolts. Elegant with impeccable fit and finish; and yet made to be used in places where mechanical failure might well cost you everything. Quite a few of...
Here's pics of the non-factory 'sporter' 52 with the Weaver 330 and Litschert objective. Also have the proper Lyman peep for it.
Back in the day when excellent workmanship was expected and appreciated,
Oddly enough, I have another 52 that someone made into a sporter with an excellent aftermarket stock. It came with a Weaver 330 scope that was wearing a Litschert objective. Really enjoy the old girls,
Another of my 'bad' habits is accumulating 22 rimfires, both pistol and rifle. Winchester 52s, 67s, 69s, Remington 513Ts, etc. Here's two of mine beside a newer iteration of the accurate 22lr, a Bergara B14R. The top 52 (1930) is wearing a 12x Lyman Super Targetspot, but it also came with a...
Paper patching is fiddly, no doubt. As you mentioned, the old guns with Henry style rifling or the shallow Sharps style may benefit from using the paper patch as that was what they were designed around. One other advantage is that at higher velocities the paper jacket allows a softer alloy to...