However, as with average MVs, the switch to the small primers has reduced the spread across the ‘statistical population’ substantially, SRP types covering 4.6 to 8.6 fps SD, a less than two to one ratio. (This compares to 3.1 to 14 fps for the equivalent values for LRP models, getting on for four to one). Primer comparisons. This is a discussion on Primer comparisons within the Reloading forums, part of the Firearm Forum category; Ok, the more I see the more I am doubting something. My reload manuals call for: CCI 500 - Small Pistol CCI 400 - Small - Cases that utilize small rifle primers and operate at moderate pressures (40,000 psi) should use CCI 400, Federal 200, Rem 6 1/2, or Win SR. Such cases include 22 CCM, 22 Hornet and the 218 Bee. These primers are also used in heavy handguns such as the 9mm., 357, etc.