A few simple rules to follow:

Reloading of cartridges is a safe activity if you just pay attention and you completely understand what you do and why. Safety glasses are a must.

Use only equipment that are in working condition, components as cases, primers, powder and bullets that you know are of quality, if you cant identify and primer, powder or bullet…destroy it before it destroys your gun and yourself.

If you have more than one type pf primer, powder and bullets, don’t keep them all on the table you work on. Always have only one canister or box open. Never substitute brand b for brand d if you don’t know exactly what happens if you do so.

Maximum loads warnings in the loading table you have for that powder and bullet combination is for your safety, don’t go any higher. Your health and the gun aren’t worth it.

Develop a routine for reloading; do all the priming first for example before you open that powder canister. Keep the cartridges in a box and label them, the empty cases goes in that same box, in that way you now how many times you have reloaded them and with what.

Bullets with same weight but different type can give you different pressures in the gun, powder brand A maybe looks like brand B or C but you cannot substitute them for each other. Same with the primes, they are colour coded but do not trust that, you have to keep primers, powders and bullets in the original canister or box, that way you can be sure of what you hold in your hands.

Kids, flames,oil, water, illness or smoking and powder DON’T mix.

When you think: I have been loading cartridges now for a lot of years, iam an expert, I know the "how" "why" and "don’ts". Stop right there!

You just introduced the element of danger in your handloading, people crashed the cars after driving thousands of miles every year, and the graveyards are full of them. Why? 'cause some of them where experts! See yourself as a beginner in handloading, easy to remember the rules that way :)