I can not tell you about the legality of this but from a safety standpoint I would stay away from having someone reload for me. A short time ago I had a guy I work with reload some ammo for my 300 win. mag. He never asked me to borrow my gun or even "dry fit"
a casing in it to check the COL. Well, needless to say the first round I shot locked the action up tighter than a drum. This was due to way too much chamber pressure and i'm lucky the gun still functions and all my fingers are still on the end of my hands. Needless to say I now do my own reloading and after all of the research I did before getting started I can honestly say how foolish I was to let someone else do my reloading.