I'm sorry but this sort of escapes me...trimming pistol brass. I don't understand why. Pistol brass will usually be lost or crack long before it's overall length becomes a problem. It's not as high pressure as rifle so it's not going to go through the same transformations as rifle. I've loaded my share for sure, 9, 38/357, 40, 45, 44 mag...others in smaller quantities. No one else I know of trims pistol brass either.
I would suggest just using them as is and save the time and effort. Yes, the pilot needs to be smaller than the case mouth, just like rifle. You could always just do a precision grind of the offending pilot to specific diameter...Information
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