I have fired quite a few revolvers and never had that happen to me. Was there a strong wind or anything? What type of revover,single action, double,,brand,,caliber,,barrel length, is the barrel compensated?
I guess that cylinder alignment can do that if it is off. Shaves bits of lead off the bullets, and can bounce them back at you. Unless you are shooting near some barracade, and debris is coming out of the cylinder gap and bouncing off that at you. Take the EMPTY(!) revolver and cock it back so you can shine a light thru the firing pin hole, or maybe white paper behind the cylinder that you can bounce strong light off of. Look down the barrel into the cylinder chamber and wiggle the cylinder side to side so you can see if the chamber is off center of the barrel. That way you can at least see a bad case of misalignment. Actually the best way is to get a range rod, a rod that is just about bore diameter, and insert that into the bore to check if the chambers are lining up. A gunsmith might have one of those if you don't want to buy or make one. Or if it is powder particles, maybe get/load cleaner burning powder. Or a brand of ammo that does not leave much crud/unburnt powder in the barrel which would indicate clean burning. But this is speculation-better give more details like the other guy says.
when i guy shooting a couple stalls down was hit in the cheek with some unburnt powder from a guy shooting next to him. the powder embedded in his cheek and was bleeding. couild have easily took his eyeball out.
I was shooting my M28 Highway PAtrolman. My son and his buddy also felt the blast close-by. Of course, all were wearing eye protection. The revolver has not really seen much shooting in ten years. I have stored it well, either in a padded gun case, or padded sleeve. It had been checked by Smith and Wesson years ago (about the last time I shot it), and it checked out fine for timing, gap, etc. It shoots plenty straight - it could be unburned powder. I was shooting some OLD PMC and some newer brand ammo. No tight extractions. But, with every round, I felt the little particles.
Powder is my first suspect. Heavier charge, faster powder, more crimp, mag pirmers, or a combination of the above should solve the "sand blasting" problem.
You're right - it feels like a sand blast. It was all factory ammo. One box was over 10 years old - but I think I had the same thing from the other box, but of course I don't recall. I was able to shoot decent groups - one ten shot string went all in the black freehand - so it seems that the revolver is OK from a function stand point. I cannot see how it would shoot decently if it had misaligned cylinders. Again, the last time I shot it a decade ago, I had sent it to Smith to be checked (have a friend who works there). They endorsed it entirely, and of course gave me a letter from Roy Jinks with all the history, etc. BTW, the rubber Hogue grips make it feel like a breeze to shoot - amazingly ergonomic.