Headspace Gauges Kit

[Doug in Alaska]

I'm shopping around for a set of headspace gauges for setting the amount of shoulder bump. I shoot .22-250AI, 7mm RUM, .338 Winchester Magnum, 7-08, 7mm Remington Magnum, 30-06, and a few more bolt rifles. I've been looking at the Hornady Lock-N-Load Headspace Gauge Kit. My biggest concern is the .22-250AI. Will this set work considering the 40˚ shoulder angle? Any recommendations?

As always, thanks for your help!

[woods]

Hey Doug

Yes the Hornady will work. I have a complete set and load for 22-250 through 375 Ruger with a 280AI in there in the middle. The place where the gauge hits on the shoulder is not important because the measurement is only relative to the other measurement. IOW it would not matter if you got a measurement on new cases of 1.575" on the 22-250AI or if you got a measurement of 1.585" because your measurements on the fired cases would expand the same amount.

For example

new case 1.575" - once fired 1.590" = .015" headspace

or

new case 1.585" - once fired 1.600" = .015" headspace


See the difference which is the actual headspace or could be the amount the shoulder moved on the first firing is what matters, and that will be the same no matter where on the shoulder the gauge hits.

[boomtube]

Woods is correct, the LnL, etc, case tools don't care what the shoulder angle is.

[Doug in Alaska]

Thanks much guys! Do you find bumping .003" sufficient for hunting rounds and bench rounds alike? Will this also be the magic number for my belted magnum cases?

[woods]

I prefer .001" with a very slight crush fit. .003" leaves the case a little loose in the chamber and will slowly lead to more case stretching at the pressure ring.

YMMV

[Doug in Alaska]

Thanks much for your help, woods!

[boomtube]

"Do you find bumping .003" sufficient for hunting rounds and bench rounds alike? "

For hunting 3 thou would be okay. But it also leads to a bit more case stretch than I prefer. For my bolt rifle varmint/target loads I prefer to neck size OR FL size to restore the location of the fired shoulders. The shoulders of fired cases are already 1-2 thou off the chamber shoulder.

You will find it's virtually impossible to consistently put shoulders at any specific point due to normal variations in case spring-back. I try to keep my MAX case (shoulder) lengths at whatever I want and simply accept those which are a couple-three thou shorter.