Small Pistol Magnum (SPM) Primers
Primers are a key ammunition reloading component. They are needed to ignite the powder charge.
There a seven primer sizes which differ by use (pistol vs. rifle ammunition), size (small vs. large) and force (normal vs. magnum): SP = Small Pistol Primers | SPM = Small Pistol Magnum Primers | LP = Large Pistol Primers | LPM = Large Pistol Magnum Primers | SR = Small Rifle Primers | LR = Large Rifle Primers | LRM = Large Rifle Magnum Primers.
Below you find a table with some common calibers / cartridges which use Small Pistol Magnum primers. Also find further below some common products in this primer size:
CCI No. 550 Small Pistol Magnum (SPM) Primers
CCI Primers are continuously tested and improved. As a result today’s CCI primers are more sensitive, easier to seat and more compatible with progressive and automated loading equipment than ever before. They utilize modern non-corrosive and non-mercuric initiator mixes for the cleanest burn possible. The CCI No. 550 Small Pistol Magnum (SPM) Primers have specifically been developed for small pistol and revolver magnum cartridges. Find all Small Pistol Magnum (SPM) Primers by following the Link.Common Cartridges suitable for this Primer Size
CartridgeBullet DiameterPrimer Size
357 Magnum357SPM
357 Maximum357SPM
Common Cartridges using this Primer Size
| Cartridge | Bullet Diameter | Primer Size |
| 357 Magnum | 357 | SPM |
| 357 Maximum | 357 | SPM |