I'm not sure what ammo could be fired through it. I have cast the bore, it shows .324/325 in the grooves at chamber and muzzle. Barrel has "Nitro" proof marks as well as a Prussian eagle. All the markings suggest to me it is not a JS gun, but the bore size has me confused.
Königliche Munitionsfabrik (zu Spandau) was suggested in this thread here: https://www.k98kforum.com/threads/gew88-sporter-at-the-front.16747/post-111504It seems many went to the Marines so I would assume KM is for Kaiserliche Marine.
Maybe! Would make sense as a test acceptance prior to issue.Königliche Munitionsfabrik (zu Spandau) was suggested in this thread here: https://www.k98kforum.com/threads/gew88-sporter-at-the-front.16747/post-111504
I am confused by it too. There is also an "8m/m" hand engraved into the top of the barrel just in front of the receiver. I've cast and measured it several times, this is the common result. My father once upon a time re-loaded for and fired this rifle. I think he did use the .318 bullets. None of the dies, bullets or load data can be found or clearly remembered at this point. He does assure me that it is too light and very uncomfortable to fire.I really don't think a .323 bore would be marked 7.7mm by the proofhouse. It is clearly marked for the smaller bullet, and I would strongly recommend you not shoot this with the larger .323 projectiles. Its a rare rifle, so I wouldn't shoot it all frankly. Maybe some of our commercial collectors can chime in.
The receiver markings are from the original commercial proofing, a load of 2.5g Gewehr Blättchen Pulver (flake powder) with Stahlmantel Geschoß (steel jacketed bullet).
From @Amberg back in 2015It would be amazing to know what the warning placards actually looked like
From the same thread... "Only rifles on Mauser M98 actions were to be accepted and issued. Those suitable for the then standard .323" bullet S cartridge were stamped with a Z-prefix registration number, while those deemed suitable only for the limited standard old .318" bullet Patrone 88 cartridge got a D-prefix number. Apparently arsenal staff thought this D or Z marking sufficient at first, as rifle D 771 shows no other markings. But soldiers usually don't read instruction manuals, so soon the .318", D-marked rifles got a metal plate too, with the warning "Nur für Patrone Mod.88" (for cartridge 88 only!) and a sketch of the distinguishing round nose bullet of that load. Rifle D 2241 shows the traces of this plate, and there is a photo of a German sniper in Senich's book that shows such a plate."After casting the chamber, this is 8x57 with a .324-.325 bore. I wonder if the "D" designation is due to the gun being Nitro proofed as opposed to smokeless? The receiver has this...2.5g G.B.P. St.m.G. Also, any idea what these S stamps are on the barrel's underside?