I carry reloads. I shoot Gold Dots; 45 acp in my Ed Brown Special Forces and 38/357 Mag in my BUG S&W 340CT. I first buy a box of the factory stuff for each cartridge and chrono it. I then find a powder like Solo 1000 that gives me the accuracy I demand as well as zero to nil muzzle flash. I then load it to the same velocity as the factory stuff. It's easy to prove my loads run the same velocity as the factory stuff.

Alan