It always amazes me when careful reloaders will use questionable powders in order to save a couple of dollars.
Also, putting nasty, corroded cartridges into guns worth hundreds of dollars.
The same thing about accidently dropping a cartrdge on the ground and failing to clean it before loading it.
More importantly, if someone offers reloaded ammunition, use it in their gun. Make sure you have your eye protection on.
My brass is cleaned and polished to the quality of fine jewelry before each reloading session. The RCBS 505 scale is perfectly balanced and the load books are out to make sure I'm using the right powder type and weight. Only one powder on the bench at a time. The Dillon 550 is carefully calibrated at each station and the powder drop weighed to the nearest 0.1 gr. The finished product goes into a cartridge guage to ensure legal SAAMI dimensions. OAL is verified with calipers. Crimps checked with a micrometer. Checks for case head bulges from over pressure as well.
I've taught my wife the same principles and trust the quality of ammo she loads as well. Our firearms vary in value from $400 to $1000 each. We NEVER allow anything but first quality ammo in them. We also don't offer our reloaded ammo to others. We don't carry the necessary insurance nor federal ammunition manufacturing licenses that would make such an action legal or advisable.
Eye and ear protection is a must. Always. I've had a 44 mag splashback from a 25 yard range and clip the top of my ear. The immediate stinging in my left ear was complemented with blood all over my fingers. A few inches the other direction would surely have caused eye damage...except I always wear shooting glasses. I was wearing 32 dB foam ear plugs, thus my bare ears were exposed to the splashback. I add muffs to the foam ear plugs when shooting the .454 Casull. Bone jarring and fun.