Ron, that particular cartridge went through an almost bewildering array of changes, as the Nordic rollers advanced from the preliminary metallic cased era, ....and forward, into the smokeless era.
There were, (and I've measured and chamber cast em',) 8 X 56, 8 X 57, and 8 X 58 reamers used ,...the shorter chambers generally the earlier variants.
The change from the .60" Rim thickness, to the .70" was directly related to the later variants, and is a relatively simple thing to figure out,....some shimstock and a set of calipers all that're required.
Get hold of this book, and, as well, get hold of my friend Croft, to discuss just what exactly you have,....he'll steer ya' straight. When it comes to getting this particular, and VERY popular European cartridge to perform properly, .....he's probably this country's leading authority.
Say hi to him for me, and wish him a Shiner Bock.
Link:
http://www.morganprinting.org/RecentSingleShotMilatary.html 
