Does any one want to give your similiar experience, ( or opinion) on the following?

I have put 1244 rounds thru the following barrel, a Pac-Nor, SSSM, for my Ruger #1, Rem 6mm. I have used H-4831, H-4350, H-4895, Varget, & R-19, using Hornady 75 gr. V-Max, & Barnes 85 gr. XLC’s.

Today, I measured, using my Stony Point gauge, & Sinclair comparator gauge, for the Hornady 75 gr. V-Max, & the OAL was, 3.474.

I usually measure 10 bullets, & take the average.

When it was new, I had done the same measurements, & the OAL was 3.445

So it looks like the throat moved .029


For the Barnes 85 gr. XLC, I had measured 3.445, & today it measured 3.468, or a

a difference of .023.

Now I understand these measurements could be a little off, because of me, etc., but I use a fairly good digital gauge for measuring, & I try to be as consistent as I can be on measuring..

My questions are:

1) is .029 , or .023 a lot of throat wear for 1244 rds. ?

2) what opinion ( would rather have facts) is there, say, in 1244 rds, it moved .029, in 5000 rounds, would it move approx. 5 times that or approx. .145 ?

3) Is .145 a lot of throat wear ?

4) I intend to go thru the same “drill†with my 06’s, & 223’s. Just wondered if any one had done some thing similar, & what were your results.

I also understand that "shooting hot", fast & hot loads will move it faster. I don't shoot either.

Thanks

A friend of mine shoots a 6-284 out of a Ruger #1 using shillan barrels. If memory serves, I believe he said he indexes every 100 rounds to move .001" longer to stay with the lands.