Neither, really. I have always said the Krag bolt cracking was from too hot of loads for casehardened steel; showed up with the abortive attempt to make service ammo make 2200 fps in 1898 and disappeared when the M1898 ammo did. Came right back in civilian rifles as they became surplus and were shot IMHO with loads suitable for High Walls and 1895s. I have had my Krag since 1988-89 and never have had a problem with it after probably thousands of handloads.