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Slightly protruding primers are virtually guaranteed to give ignition problems in some guns.
Ideally the primer should be slightly below flush level.
A quick and easy way to see if the primers are protruding is to use a straight edge. If you can slide it the whole way across the case head, and see a slight gap between the primer and the straight edge, then you're getting to where you need to be.
If the straight edge catches on the primer as you slide it across the case head, you've found your problem.
Take a couple of factory rounds and use them as your gauge for what the primer should look like when it is seated correctly.
As Cheapo notes, it could also be a case of the strain screw being shortened, which reduces tension on the main spring.
This, however, doesn't really fit with the type and pattern of misfires you're noting.
I don't have my books with me (I'm in Pennsylvania, and my books are in Virginia)but I seem to recall that factory spec for the strain screw is .655 inches long.
I'll have to confirm that when I get back to VA in a couple of days.
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Beware the man with the S&W .357 Mag.
Chances are he knows how to use it.
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