Small Rifle Magnum Primers
Small rifle magnum primers are something of a specialty item, being primarily used with ball powders or in cold weather. As the magnum designation suggests, they are more powerful than regular small rifle primers and the two should not be used interchangeably when you're reloading.
Small rifle magnum (SRM) primers can be used for .223 Remington/5.56 NATO, .454 Casull and .17 Remington.
CCI is a top source for SRM primers and you'll find some for sale below; their primers are known for their reliable ignition when loaded correctly so you'll get the performance you demand when you're out in the field.
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