Gotta be careful, that's for sure. This is why they say only have 1 powder on the bench...
Makes me think about keeping rifle powder in a separate locker from pistol powder as an extra measure...
I have a roll of masking tape on my bench and label the thrower each time with what is in it.
Reloading is less complicated and less dangerous than driving a car, but nobody starts a thread cautioning us to stop at the stop sign and look both ways before proceeding.
When you are done using a powder, empty the hopper etc back into the can, and put the can away - EVERY TIME - and you won't have any problems. This is not rocket science but it's so simple that we tend to forget the consequences.
This works for me:
Only one powder out on the loading bench at any time during loading. It sits on my bench just to the back of my hopper with the label facing me.
Zero powder remains in the hopper at the end of the reload session. All remaining powder in the hopper goes back into the same bottle that was on the bench at the start of the session even if I'm going to reload using the same powder the next day.
Triple check load for caliber/bullet combo and that my scales are zeroed at the start and spot checked during the session.
Any spillage on the bench or floor is considered contaminated and it is collected into a plain bottle to be later burned up at the next camp fire.
So far it's kept me safe...
I am a novice reloader and reload for my hunting rifles only...... I agree with the posts above....
Part of the appeal to reloading to me is taking your time and following the process to a tee..... Taking meticulous steps to reach meticulous results..... I am not set up, nor will I likely ever be, to "bang out" 500 rounds in an afternoon..... I like to focus on one rifle and make sure I am doing all I can to make the most accurate kinds possible...... The safety stuff comes along naturally.......
I only use 4 powders, and am actually contemplating getting 4 powder measures and labelling them.....
I did that too, definitely a little overkill, but I ended up setting up a tool head with dies and a powder measure for each caliber/powder combination. Then I put matching color coded stickers on the powder measure and bottles of the powder it was set up for.



























