RE: different primers different story
Outdoorsman - Is this the same lot/package of primers? Or have you used different lots. It could be that there is some contamination on some of them and not providing enough 'ignition'.
I'd try another package from a different lot before blaming the w209. A lot of guys use the W209s without problem like Dave says. If you're having problems with them, it may be something else.
Not sure what.