I don't believe I ever had a hiccup using BH209 and Fed209As for either my encore of accura. Then again out of habit, I always check to make sure to see daylight through the breechplug after every shot. Out of experience, will not swap brands of primer w/o going to the range first. Have seen different results w/ different primer types at least for 777. Have never deviated from the 209As for BH209 as I believe that is the recommended primer.