I’m using CCI#250s. I tried using Rem #9.5s but I got better ES with the 250s with the exact same speed. I haven’t tried Fed 215s but have heard good things.
One doesn't need a magnum primer for 53 grains of powder. Federal 210 match primers are the cat's meow. I will use them with my new 6.5-06 AI once I get it and probably use IMR7828 since I have a lot of it. For many years I used the Hornady 129 grain interlocks. Last couple of years I used the Sierra 130 grain TGKs. Got some 120 grain lead-free to try for this year. Hornady GMX and Nosler E Tips.