yucky
Most of the time this is due to a sticky chamber and it can happen with regular brass, especially after firing a few .38 Specials and switching w/o cleaning to .357.
The easy solution is to use a range rod to tap the case against the breechface and force the primer back into its pocket.
Pressure is equal regardless of flashhole size. There isn't enough volume in the primer to cause a pressure drop over the flashhole.
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