I've fired 32 Auto, 32 S&W Long, 32 H&R Magnum, and 327 Federal Magnum factory ammunition in my SP101. I've also fired various handloads, though none loaded up to maximum 327 Fed. pressure.
I _HAVE_ recently experienced pierced primers. I was shooting some 32 S&W Long lead wadcutter ammo the other day, from S&B. It's very mild, as one expects from 32 S&W Long, so clearly NOT an over-pressure problem. The primers on about 1/3 of the cartridges I fired are blackened and (very nearly?) pierced. Nothing bad came backwards, and I only know what happened because of the blackening on that ~1/3. The rest are normal-looking.
I'm not sure how many rounds I've fired in total through this gun; a few hundred, perhaps. These cartridges from the other day are the only ones I've experienced this condition from, that I can recall.
HTH.