My goodness, those are some scary looking primers. For sure you have gas leaking around them. What others said before, and I'll add that I won't load Unique on my progressive press.
In the process of weight checking my Unique loads on some 45 Colt reloads from the progressive, I found the powder measure always crept upward in charge weight, never downward, whether the reservoir was baffled or open, whether the reservoir was full or half, always upward in weight. I checked to be sure the charge screw wasn't creeping, tapped down the reservoir before starting, but always, the charge crept up.
I now throw Unique powder with the measure one case at a time, hand weigh and trickle to adjust all Unique loads now.
I'm using either an old Lyman #55 measure or a Hornady LNL. Using Unique, the Lyman does better than the Hornady for me. Unique is a good powder in its versatility, but meters very badly in my experience. The always creeping heavier charge off the LNL measure scared the daylights out of me. Other powders go up a tenth, down a tenth, back and forth, back and forth, but not Unique. I can't explain it for sure, but I think it's related to settling in the measure reservoir.
I think you're out of luck on a S&W warranty or repair, and maybe a smith could make and fit a larger firing pin bushing, but I don't know if a smith would take on the potential liability.
Primers are cheap. When in doubt, throw them out.
