I was treated to one of the above in .303 for my birthday. Using it the other night i noticed that some of the primers were coming out with a distinct "pop" and exiting significantly faster than some others. This has never happened when using a full length case sizer.

Can anyone shed any light on this? First immpression is that there is some unburnt primer powder left and is somehow being ignited by the extractor pin but with my limited knowledge I don't think it likely.

Just interested on any other thoughts.

Cheers

Clive