Please, what does the phrase "run out" mean

in reloading. I read about guys talking about

"run out" and talking about .001" or .002".

Is it the bullet creeping out of the neck, or

deeper into the neck being "run in"?

It relates to measuring the wobble of a bullet at 90 degrees to the length of a cartridge. It's taken with some sort of dial indicator while the loaded round is rotated in "V" blocks or other means of holding the shell. Such as this pic of my RCBS case center.





You can see that .223 round had .002 run out.

Nice illustrated explitive,Grizz! roger

grizz,

You said it's measuring the wobble of the bullet.

Based on the pic's I am taking this to mean how

less than perfectly straight the bullet is pro-

truding as compared to the imaginary perfectly

straight line perfectly centered. Have I got it?

If yes, how did that degree of "non-straightness"

come to be known as "RUN OUT"?

Jack, you got it! As for the term, it's pretty much a standard in the machining industry to describe a "less that straight condition". It has migrated over to reloading to be a short cut to say the bullet is off the perfectly straight line down the center of the cartridge.

Lots of things affect it, the brass case itself has to be straight, the bullet and case neck have to be both held in alignment while being pressed together to produce straight ammo.

Usually this requires a precision seater, those are made by Forster and Redding. Don't waste your money on the RCBS seater though. In-line seaters made by some other companies use an arbor press to hand seat the bullets, most often seen used for bench-rest guns.

OK grizz. Thanks for the assistance; I had been quite in the dark.