Shooting wize, is there any difference between homemade or factory's bullets ?
Bullets, as in projectiles, yes, there is a diffrrence In hand cast vs factory. Factory is more consistant in finish and fit. Finish is important for accuracy. But hand loading, using factory projectiles, measuring loads carefully after doing a ladder test for YOUR gun using certain Projectiles under certain loads with certain primers; you can work out what works best for your fire arm. Best groups etc. Longer range enthusists measure powder down to 100ths of a grain.
Me, to the 10th is good enough.
Each powder is different. Primers make a difference. Different projectile mfgs.
Factory actually has too much variation for more accurate long range shooters. If you chronograph the factory rounds, you might get the averahe advertised out of 100-1000 rounds. And being generic, they will work great in some firearms and maybe not others. One of my .243 rifles likes the 28-2900 fps cartridge where as another will like 3000-3100 better of the same caliber, projectile, powder etc.