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it is loaded BELOW maximum allowable pressure. So why limit it's use at all? I don't get it.
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If you think max allowable pressure is when you have to beat the empties out of the cylinder, then yes, the .38SPL+p is very mild.
Limiting the use of +p in some guns isn't a matter of what is "safe", what the gun will take before blowing up, or anything close to that.
Its about general use, and a huge range of possible guns that the ammo can be fired from.
Any properly built .38 Special that actually is damaged by a couple of cylinders of +p is a fluke.
However, some guns will wear at an accelerated rate given a steady diet of +p loads. How many will it take? no body can know. SO they recommend limited use.