Originally Posted by Curt
Just finished a batch of (50) 9mm when I noticed they looked different / short.
I always set up my equipment each time I start a new batch to make sure nothings slipped or out of adjustment.
The rounds were reading 1.169" OAL on my micrometer with 147gr JHP, 4.3 gns of Winchester WSF powder. Just like the load data sheet said.
So I went to a box of ammo that I made over the weekend and it was reading 1.199. I checked and double checked that batch when I made them they were all perfectly 1.169".
My son fessed up that he dropped my micrometer so I got the one I keep in the garage and sure enough the bullets are over seated by about .03".
Will this cause an over pressure situation?
Sorry, I'm a little confused.
With your "Good" Micrometer what does your new box of 50 rounds measure, 1.169 or 1.199?
With the same Mic. what do your "weekend" bullets measure, 1.169 or 1.199?
If they are 1.199, just seat them deeper to 1.169.