Use WW760 in my 6.5x55ai and only had one failure to ignite in 860 rounds fired. CCI BR2s. I believe it was a faulty primer.
Everyone said I MUST use a magnum primer. So I tried CCI Magnums. The supposed increase in velocity was minimal and my SD an ES and group sizes enlarged.
Continue to use CCI BR2s. YMMV
And interestingly the BR2s are nowhere near the top of the Primer Brisance Chart. @johnd your Rem 7 1/2s are right near the top so good choice.
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