Just bought a M91/38 short rifle in 6.5. Shot 20 rounds of PPU in it, and noticed the bolt required a decent amount of momentum to get it fully up at the last bit of travel. Empty, no issue, but with fired brass....gotta open the bolt with a bit more vigor.
I polished the cam in the bolt where the cocking piece travels and the matching cam on the cocking piece, the locking lugs, cleaned the area where the locking lugs lock (bit rough in there but chambers and locks everything quite fine). In taking a piece of brash and chambering it with only the bolt body (no cocking piece or spring) it still has problems with the last bit of travel during primary extraction.
I'm thinking it's the chamber, and I need to polish it much more than how I have been (maybe with croil and oversized brush with brass or steel wool wrapped around it). Or is it the locking chamber area?
Would like to get it at least a tad easier to wack open.