biscuit eater

My prediction is, you will experience a crud ring. Using the 209 primer, in lieu of the #11 cap will virtually guarantee a crud ring. You probably can reduce the crud ring by using reduced strength primer such as the 777 primer. You also could use them adapters made by PR to reduce the crud ring.

Swabbing between shots can be relaxing, and will allow you to enjoy shooting 777 powder in your new rifle. Others, except Semisane, have pointed out another option; the choice is yours to make.