03-22-2011, 08:19 PM
Pappy is correct, but we should extend that to include piercing of primers in AR's as well.
However, Bill Alexander tried multiple primers when he was experimenting, and found the CCI450's gave him the most consistent ignition, least chance of slam fire, etc. Thus most of his loads were developed with them. He has said that Wolf small rifle magnum primers are very good as well, and some loads have been developed with those as well.
Lots of people have been happy using both bench rest and standard primers without issues, but the thicker cup of magnum primers allows some safety margin against piercing and slam fires as noted.
However, Bill Alexander tried multiple primers when he was experimenting, and found the CCI450's gave him the most consistent ignition, least chance of slam fire, etc. Thus most of his loads were developed with them. He has said that Wolf small rifle magnum primers are very good as well, and some loads have been developed with those as well.
Lots of people have been happy using both bench rest and standard primers without issues, but the thicker cup of magnum primers allows some safety margin against piercing and slam fires as noted.