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I used the CCI 41s when available,but also used the CCI magnums and the Rem 71/2s. As for any gas gun,make sure the primers are seated slightly below flush with the casehead.
I have CCI 41s and 34s on hand - honestly, just go with regular CCI or Winchester rifle primers if you are concerned with hardness...
As a side note I use 205M & 210Ms in my autos - argueably relatively soft primers, and have never had an issue.
They're just a marketing gimmick for small rifle magnum primers. Magnum primers are about the powder used, not the rifle. They're made to light hard to ignite powders and cold weather shooting.