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How can I number cases without changing case thickness?

The last set of 4-shot groups where I was testing 3 different neck thickness' were .230, .200 and .224; ammo and rifle are not fully tuned. I've got several variables I'm testing/working on to try to get the group size smaller in the 0 to 1.5 range. Also working on wind conditions as always; the elephant in the room.
Sounds like your doing a good job but I think the ink thickness affecting accuracy is a way out theory.
 
Webster, I originally thought the ink marks were 0.0003" thick based on ball mic measurements on cases which turned out to be inaccurate; this .0003 amount exceeds the variance of some of my case prep parameters. Now that I know the ink thickness is .00004", as stated I consider this to be negligible regarding case prep.
 
I can't help but laugh a little bit at this. And bbls are chambered at less than that or the smith is crap. Lol! Seriously, I kinda doubt the op's measurement but maybe if the ink was really heavy and wet. It just puts things into perspective a bit and I like that. :)
 
A number of years ago I was doing some load testing. I had all my different loads neatly lined up in the columns of the ammo box. I put a sticky label on the top of the box for what each column contained. Somehow when I was taking the ammo box out of the truck the lid opened and the rounds fell out all over the place. But did I curse and swear? You bet your life I did with all that work wasted. Since that time whenever I do load testing I take a Sharpie and mark the side of the case with the load and/or seating depth. Now if I get the damn rounds mixed up it’s easy to sort out. Also I can shoot a string eject the cases on the ground and then go back and inspect the cases for primer flattening etc. and instantly know with confidence what load each one contained.
After doing this for years the one thing I can assure you is that I have never observed the Sharpie marks on the outside of the cases having absolutely any effect on accuracy. Getting the rounds mixed up when load testing most certainly will cause problem. As far as getting the marks off the cases when I’m finished I simply wipe the cases with a paper towel wet with rubbing alcohol. The alcohol wet paper towel also works very well to get the soot off the necks. Trust me on this one there are a lot of measurements you can take when reloading that will effect accuracy but Sharpie marks on the outside of the case aren’t one of them.
 
I can't help but laugh a little bit at this. And bbls are chambered at less than that or the smith is crap. Lol! Seriously, I kinda doubt the op's measurement but maybe if the ink was really heavy and wet. It just puts things into perspective a bit and I like that. :)

And people call me eccentric. :-)
 

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