Large Rifle Primers: Which are the most rigid?

[mainer_in_ak]

Many years ago, I remember cci was making extremely rigid primers capable of safe operation in semi autos that run the risk of a slap fire. Do these primers still exist? If they don't, does anyone know of a large rifle primer that's especially rigid, and tougher to ignite than others due to a stronger metal? In my experience, Remington Primers have been the softest, and I'm wondering about the other end of Primer Rigidity spectrum and what other's have experienced.

 

[gunbugs]

CCI #34 large rifle primers are the military contract primers available for reloading. If you can get your dealer to order them. They are available through midway, hi-tech ammo, and others as well.

 

[marshall]

CCI #34 large rifle primers are the military contract primers available for reloading. If you can get your dealer to order them. They are available through midway, hi-tech ammo, and others as well.

I agree, CCI 200 would be my second choice.