Winchester WLR. However all my rifles are factory hunting rifles except one custom rifle but none seem to like one brand of primer over any other! I've done a lot of loading over the years for calibers ranging from .224, .243, 257, .277. 7mm, .308, .338 and .458 and have never found a brand of primer any of them shot differently (other than velocities) that any other!
My go to’s have always been Remington 9 1/2 and Federal 210M, but as others have said, I’d grab whatever I could right now. I’ve actually been luckier lately getting magnum primers. I picked up a couple thousand Ginex large rifle primers earlier this summer at a great price and free hazmat, but I haven’t shot them yet.
Federal champions, they're available around me and considerably cheaper then the rest,haven't noticed much difference from the other brands of primers for my uses