Wha'st difference between Federal 205MAR and Federal 205M primers?

[GentleBen]

I know, the box says it is AR Small Rifle Match. But what is the difference with regular small rifle match primers? Can I shoot them with confidence in my bolt guns? Harder primer cup maybe?

 

[700sendero]

That's a very interesting question....I was shooting some 60 gr vmax outta my sps tac yesterday..using remmy 7 1/2 primers..never had a problem...had a hang fire...heard the hammer drop then discharged...never had that happen b4...while only a split second kinda weird....idk....do the 7 1/2's have a harder cup?

 

[FLIGHT762]

Yes, the 205 MAR has a harder primer cup for AR's.

http://bulletin.accurateshooter.com/2011/09/new-federal-gold-medal-match-primers-for-ars/