Thanks.OP might be that you are more observing than others and found something to comment on. For many years the local PD gives me all the ammo that needs to be disposed of. For years I used a hammer type puller to break down all the ammo. I never observed primer dust anywhere. After 20 or so years i purchased a Cam Loc puller because I purchased several thousand surplus rifle rounds to reclaim the bullets and primers. I also came up with the idea of using wire strippers to pull bullets. First I used a piece of pipe outside the ram to hold the pliers. Then found that extention.
In all the several thousand primers I removed and reused I can't tecall a single dud. Some even had to be dried out for months before use though due to being in a flooded area for a long time.
I may not be qualified to say this but I would just seat any and try them. They won't blow up but might cause a squib at worst.
I wasn't questioning their overall viability for reuse, have always done so--mostly just reloading the emptied but now already primed case like in below picture. I'd see the residue but reuse the case without reservation.
Occasionally, I will/would remove primer and reuse in a different case as I did on Monday. What gave me pause this time was seeing the extent of actual damage & missing cake. But as I reported back, they shot just fine. Henceforth (love that word), I'm just going to reuse the primed case.
Some time ago I bought a cam loc puller thinking it'd be better than the hammer, but Acme coated 45acp bullets are too hard, slippery, and without enough flat surface area for the collet to grab. Had to nearly crush bullets. Not certain of the plier method yet but it's worth a try and I'm thinking a sharper edged wire stripper will best grab the bullet.