I've read with handloading older cartridges (7x57, 6.5x55, ect) that you can safely go up to modern loadings (Hornady lite magnum's for example) in newer rifles, and in older rifles if you get them ok'd by a good gunsmith, my questions is, what do they check for, or more importantly what should I ask my gunsmith to get a feeling for if he's up to the task? I'm interested in working up some 7x57's for my Mauser Model 1908, I'm sure the normal loads will do just fine, but I've purchase some Hornady Lite Magnums out of curiosity.