I have several hundred shots with the Kleenbore Primers and have not had anissue with them in both a T/C Omega and a T/C Firestorm 209. In fact, I have found that they are in fact cleaner shooting as advertised.

I have had to re-dial loads slightlyto accomodate the primer change and maintain POI.

Did you shoot a Kleenbore and then a WIN primer? One right after the other? Are the results the same?

Also, check your breeck plug to ensure that flash channel is clear and clean. If this is clogged slightly, you could experience some blowback pressure in the primer cup.

Tahquamenon