My german k98 isn't a bringback, but is a baltic capture as opposed to a russian capture. 1938 S/27 (ERMA) code, all matching except for bolt. Think it might be over headspace. Then again, my M24/47 (and all of them I looked at) shows excess headspace on gauges, but has no overpressure or case stretch when fired, so I'm more apt to blame gauges to some odd SAAMI print than I am a rifle with a new barrel.
Now... a harder find: 8mm ammo. Sarco or Samco Global has 50's Iranian, but I've heard bad things, and at $0.40/per, not worth pulling the powder and projectiles to load into newer cases and primers. Commercial is between $1/per (Privi, which admittedly is good stuff) and $2/per or more (commercial loadings, so weak anyway). I'm wondering if the Privi Partisan stuff is the last we'll see of cheapish 8mm. I do have the RCBS trim die to make 8mm from .30-06, but there aren't many .323 projectile choices and I'm not quite up to casting yet. Also, I have a semi-auto that doesn't like bare lead projectiles.
Good catch on the bringback, by the way.