I will shoot reloads from close friends I know very well. (usually in their guns LOL). They may want another set of eyes hands and person when testing loads or a firearm or some such. Unknown reloads get weighted for an idea then disassembled if I take them, I normally find a reason not to if at all possible. As part of a club members or friends estate I will take them and disassemble them selling or reusing the components. Less the powder and primers off course. Bullets even though you know the weight you still don't know the manufacturer ( jacketed) or alloies lubes ( cast) and its my luck Ill stumble on a top performing load with these components and not be able to duplicate it.