Lee case trimmer Fail...

There is nothing wrong with the Lee Trimmers.
There may have been a slight "burr" on the tip of the trimmer. [the part that goes through the flashole]
This may have worn off and shortened the trim length slightly.

Regardless, a case that is .004" shorter than min trim length is certainly NOT ruined.

I know many persons who make 308 Norma Magnum cases from 338 Win or 7mm Rem Mag cases.
These finish up about .030"-.040" shorter than min trim length. No harm comes from this practice.

There is so much paranoia about everything having to be "just so" that it absolutely amazes me.

Worry about cases that are too long, not those which are a bit short.

Regards, Eagleye.

I'm starting to realize this. I'm new to reloading and very conservative, but I have necked down 30-06 to shoot in my 270 and they always end up quite short.

I love my lee case trimmers.

George
 
I don't have the zip trim but were you using the exact same chuck? The lee trimmer goes till it hits bottom of the pin so 4 thou between two different chuck/holders wouldn't be crazy.
As stated, 4 thou is nothing to worry about.

Different chuck, as I bought the drill attachment - but the shell holder was the same screw on one from the zip trimmer. I did measure to confirm
after switching to the drill and it measured the same. Just wasn't expecting a change in measurements within the 1st 300 brass. Caught me off
guard is all, got my back up a little but am fine with it now, thanks to all the advice here.
Looking at the tip of the trimmer that goes through the flash hole, seems to be slightly peened over, likely
indicating I may have been putting too much force on the end of the trimmer.
 
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