I have not had to purchase small pistol primers for a few years, but when I did purchase and use Remington 1 1/2 SPP's, they worked just as reliably as any others. One thing that I found, and don't know if it's still true, is that the diameter of Remington SPP's is ever so slightly smaller than other small pistol primers. Since the diameter of Remington and S&B primer pockets are slightly smaller than other primer pockets, they seem to fit better in those cases. They also seemed to seat too easily in the primer pockets of other cases.