I don't shoot/reload in large enough quantities to make hazmat fees pay, so I am limited to what is available locally.
In magnums, I have been able to work up very consistent loads with the winchester large rifle magnum primers; HOWEVER... in cold weather (15*F) I have noticed a lack of consistency with them, including failure to fire. I think that I tracked the FTF down to excessive/thick lubricant on the firing pin/spring. In moderate temps, the WLRM primers have produced low es/sd, but in colder weather, not so much. When my current 1000 round box gets low, I'll be looking for something else. I did pick up a couple hundred FGMM Magnum primers to experiment and they worked well, but the local availability is poor.
For regular large rifle primers, I personally have found no reason to look father than the CCI 200. Good availability, consistent, reliable.
For my AR15s I use Remington 7.5 benchrest primers. No complaints with these, either.
N8