I have been using Blackhorn and non-magnum standard Winchester 209 primers for a very long time. I have never had a single hang fire with 90 grains and 250 sabot out of a CVA Accurra w/Blackhorn breech plug. If OP wants to search and pay more, that's fine, but they've never been needed IME.
I also don't take any special precautions with my primers other than keeping them in a zip loc baggy. Hell they like to fall out of the platic square holders and I handle them with my bare hands to put them back in the boxes. No issues.
I also don't do anything special with my rifle other than avoiding bringing it in from the cold into a warm house. I've left it loaded from the previous season until the following and its never misfired after sitting for loaded for 8 or 9 months.
My recommendation is that the OP buys what he can find, shoot them, and draw his own conclusions. I wouldn't wait around looking for a miracle magnum primer as if the others won't get the job done.