I have two breech plug one setup for W209 and one CCI209M will see if there's any change in primers sticking in the breech plug. in my last outing with W209 I had some stick with 105gr & 110gr but not 120gr also. in may 1-30 twist mountaineer I had none stick with it setup for CCI209M from 100gr to 120gr. just working the bugs out.