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The best way to check primer seating is to use a vernier caliper and measure the depth of the seating. Nominal is .003" depth. Even if the primer is flush, it may be "out" enough to give a light hit.
I've found that the "new" Winchester primers are actually slightly more sensitive than the old ones with the Nickle plating, that being Winchesters stated purpose for changing to an unplated metal for the primer cups.
The sensitivity problem is probably the seating depth as the primers are .0005 to .001 "shorter"- by my measurements (but will vary from lot to lot), than the Nickle plated ones. I always seat mine to bottom out and even my match pistols tuned to pop Federal primers rarely give problems with the Winchesters except in extreamly cold conditions (for competition shooting ~70deg.).
For a "hard" primer look at the CCI's !!!
Harder yet is the R-P #5 1/2.
Hardest I've ever seen were some Fiochi and some CBI (Brazilian) ammo that took 2 hits from a new S&W to "pop".
Hope this helps.
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"There is no such thing as a second place winner in a gunfight" Bill Jordan
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