I also agree that you have much less of a chance of good accuracy with a hotter primer in reloading centerfires or muzzleloaders. But was hoping for the best. A primer or cap of any type should match its load. In my opinion, #11' s probably do match the ~90gr powder loads. The 209' s are probably too much for even ~150loads. But I would much rather miss or let an animal walk than for a misfire.

I bet the 209' s are like putting a CCI250 primer in a 308Win with Varget. Which I have also stupidly tryed in the past.