Richard,
I do not think it is just due to the firing pins. I just read the reviews on cheddite primers at Ballistic Products and there are comments there about pierced primers---from users that are probably not shooting hammer guns. Even more concerning is that the Cheddite, Fiocchi and Rio 209 primers have a diameter of 0.242". The CCI, Win, Fed, Rem, etc. 209 primers are 0,241" diameter. This means that these cheaper primers stretch the diameter of the primer cup. This means that when you start using Cheddite, Rio, or Fiocchi primers you have to stitch with them or risk having your CCI or Win primer falling out or blown out on ignition!!! Even though they are cheaper---I would not risk using them in any fine gun.
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