The feed rails on most Mauser actions ('92-'98) are designed for the taper of the cartridge case they were made for. When re-barreled to a cartridge with like tape (22-250, 257 Roberts etc.) they most often feed fine. However when cartridge cases of minimal taper (.308, 7-08, 6.5-08, etc) are used the feeding problems are frequent. The problem is when 3+ cartridges are in the magazine the shoulder area of the case is held by the feed rail and the rear f the case is not pushed up so the bolt can catch it. Also with the shorter cartridges the cartridge head does not slip out from under the feed rail soon enough and the bullet nose is pushed into the side of the back of the barrel instead of into the chamber. The rails can be altered to feed these cartridges but you must know what you're doing as once you remove metal from the rails there is no putting it back (easily anyway). Some of the shorter length M98 actions seem to feed the .308 without alteration though. One has to try them to find out. I've two Yugo M48s, one feeds 7.62 NATO just fine, the other doesnt.
Larry Gibson