I changed the #11 fire system on my Remington 54 cal. to a cabelas 209 kit last spring. Late last week I did a trigger job on it so it has a nice break at 3 pounds. Most of My 700 center fires are at 2.5 pounds but it didn't feel right on the ML. Last spring I had issues with the 209 primers which were CCI's too. Decided to start from scratch looking for a load again.
Started at 80gr. T7 and win w209 primers. Same issue with the primers so switched to Rem. sts with the same results. Guess I'll live with the primer issue as it didn't seem to effect any thing.
80 & 90 grT7loads with TC orange sabots (slip fit)and 230gr. HP XTP's
100gr. T7 T/C orange sabots 230 HP XTP's . 7 thru 9 was with out swabing between shots. Apperas both my remingtons will group two shots nice with out swabing but better swab for 3d one.

Al