I only ever had a model 1912 Karabin that was sportered. The bore was rough. It could not stabilize 139 grain spritzers (Korean made factory ammo). At 50 yards, I was hitting paper, but, some of the projectiles were going through the target sideways!

I regret not buying a pristine, all matching 'Mountain Karabin', about 40 years ago at a local gun show! Norwegian Krags were priced a lot lower than U.S. Krags in those days.

(Caution - Remember Norwegian Krags have a 'left-hand' barrel thread, should you ever consider re-barreling).