Wolf 5.56 primers? What gives?

[Fatelvis]

Wolf states that the 5.56 primers are for .223 rem/5.56 Nato loading. They are slightly hotter than thier SR Magnum primers. I wasn't aware loading for my AR required "extra hot" primers. Are they necessary? Thanks-

 

[NRA-Highmaster]

In a word, nope.

 

[Canuck-IL]

They're not just hotter, the cup is harder and, yes, that matters. The regular SR are really soft. Personally, I've seen no difference between the Mag SR and the 5.56M SR.
/Bryan

 

[Randy1911]

The harder cup is to help prevent slam fires in AR's. That is the big difference.

 

[Walkalong]

Some ball powders benefit from a "hotter", or "mag" primer, but it isn't an absolute necessity, and it has nothing to do with caliber until you get to the great big cases of slow burning stuff, which can really benefit.