Make your handloads match factory specs. Shoot and practice with them.
Buy ONLY one box of something good (expensive!) like Speer Gold Dot, shoot only only mag of Gold Dot to test for function, and carry the rest?
The quote is from another thread that I didn't want to hi-jack...
I'm assuming that you meant that he should copy the characteristics, i.e. velocity, energy, projectile weight, etc. However, other than with years of experience, is there a way to identify the exact brand and type of propellant or propellant mix used in any specific load.