I too have shot 1000's of 209 primers and 209w remains my primer. I must admit I haven't tried any of the new cooler primers now on the market b/c they haven't been readily available uphere till recently and mainly never needed too.

You may or may not have a 777 crud ring with the encore, so trying some of the cooler primers if that problem arises might not hurt either. I know a few TC shooter who can't stuff a secondary down the bore with T7 which causes them worry for hunting purposes. Personally I don't have that problem in my Knight, Remington or Savage.