Around me CCI is usually always in Stock with Magnum Primers seem hard to find. I did find Winchester LR Magnum primers yesterday and picked up 2 packs of 100. Have a 1100 CCI Magnums and considering if I should return or exchange the 1000 count I got and get small primers since I don't have any of those or maybe just stash it. All the load data I read in the manuals used Winchester or federal primers.