7.5m/m Schmidt-Rubin nomenclature


#1

I have a Schmidt-Rubin cartridge for which the proper ID has so far escaped me. It has a paper-patched plain lead bullet (no steel cap) and is in a M90-type case with a flat brass primer. The headstamp is B T 12 11 (B at 9 o’clock, 12 at 12). I’ve had this round for a very long time & have never been sure what I had. Can anyone help? JG


#2

JG, I may have the same round. and I would also like to have an answer. Does the primer have black seal, and is the neck paper patched down to the shoulder on yours?
Thanks,
sam


#3

Hi
Do you have this round ??
this is a 7,5 GP 90/03 Mod.1889

headstamp D 11 T 3

reagards
gyrojet


#4

gyrojet, I have it with T 10 T 06 headstamp, and have both rounds as 7.5x53 Model 1890. I would like to know what they should be called, as the full patched lead bullet, looks a lot different.
Thanks,
sam


#5

I hope I’m not adding to the confusion but I have two rounds in this calibre with the 53mm caselength and have come up with the designations of;

7.5mm GP90 - (T 6 T 06) paper-patched roundnose lead bullet - pretty much as described by J.G.

7.5mm GP90/03 - (T 12 T 00) paper-patched, steel-capped lead bullet - as pictured.

I cannot remember where I found these designations but it was very likely from Gordon Conway’s Collector Cartridges catalogues. These are generally extremely reliable for those that haven’t seen them.

Jim


#6

Jim has the right designations for the lead bullet, and the metal-capped bullet. The basic 7.5 ball rounds were:

Model 90 - Round-nose, hollow-base, paper-patched lead bullet wieighing 211 grains. MV approximately 1,970 fps from a compressed charge of semi-smokeless blackpowder called P.C.88 developed by someone named “Schenker,” a chemist who became the manager of the Federal Ammunition Works (Eidgen


#7

Certainly of great help and interest to me!! Thank you John.


#8

bullet’s for the 7,5


#9

Thanks to all for comments. I’m sorry I had to be away from this thread for a couple of days. My cartridge does agree with the one mentioned by Sam, having a very long paper patch coming almost to the bullet tip. I have the Grieder article & for a very long time it was my sole source on Swiss rifle ammunition. There are some aspects of his ID that concern me however–one is that he mentions a rounded primer cup (which is correct for very early S-R rounds) whereas mine has the flat brass cup and why the M90 would have been produced as late as 1911, long after being superseded by the M90/03. Finally my cartridge is does not have a compressed propellant charge, as it can be heard easily when shaken. Again, thanks to all for information and interest. JG