Please don't spray wash the bolt, disassemble it and clean it, avoid oil in my opinion. Reassemble and check firing pin protrusion, .065" to .070" is in the ballpark. Check the gap between the extractor hook and bolt face, should be just a few thousandths more than your rim thickness. If your ammo in batch 1 was sized a little too much' normally the mauser extractor should hold the rim firmly enough for headspacing and firing unless it is too sloppy and the cartridge is being driven forward by the firing pin to the limit of it's travel. The rim/extractor engagement was never intended to provide headspacing. The shoulder was designed to do that. Depending on the type of safety installed, you never specified, a striker safety requires possible alteration of the striker travel which could contribute to your issue and occasionally a trigger safety with an overtravel adjustment will push the sear up to bind the striker travel. Yes, Mausers are 'simple', but are engineered for all the beautifully designed pieces to work in harmony. Aftermarket stuff needs be installed by grumpy old men who fully understand the system. IMO.
