what are you using to measure headspace on 30-06AI?

I've put in a call to Stoney Point but thus far, they have yet to respond.

Big Al

Do you mean headspace or bullet seating depth? Headspace is measured with a headspace gauge and I didn't know Stoney Point made them. Bullet seating depth can be measured with any number of gizmos, the Stoney point being just one of them. The fact that it's an AI vs a straight '06 doesn't make any difference unless the particular gizmo you are using requires something that fits the chamber precisely.

Ray

quote:

measure headspace on 30-06AI

If you are really asking headspace. There a headspace go/no-go guages for most the various AI. The 25-06, 20-06, 35 whelen will use the same. The 270, 280s will be different because the headspace of the parent was different.

Ray,

No, I don't mean case head to bullet ogive. I mean case head to datum line on the shoulder.

I've got the RCBS Precision Mic for 30-06, but of course the shoulder angles are different.

It looks like Stoney Point does not list anything for the Ackley but sometimes manufactures don't list all their stuff on the web. Thus my question to them in case they can come up with anything to handle my situation.

Just curious why you want to measure your headspace? If it is done correctly a factory round will be a crush fit. If not take your brass neck it up and then form a false shoulder moving it back until you get a nice firm fit. Load fire and then adjust your loading die accordingly.

Ramrod,

I guess I'm not explaining myself very well.

I want to make sure when I size my cases, I don't push the should back too far and 1) create too much headspace and 2) subsequently shorten case life.

What I do is slowly lower the die as I watch the sizing line mark on the neck. I stop when I touch the shoulder. If the brass gets tight after a couple firings I then bump the shoulder. I probably have around 15 various AIs and my on wildcats (shoulders mover forward) I have never Measured to set up a sizing die. I'm sure others do and maybe they can help.

If you are only going to neck size like you mentioned (unless I'm confused) in your other post then how will you effect the shoulder?

Often in the wildcats of my design I would simply use a neck sizer until they were hared to chamber. Then I would have full length dies made.

Big Al

Now I see what you're after.

I think ramrod has the right idea. Size only to the point where you are just touching the shoulder but not moving it. I have found that sprinkling a little moly on the case before sizing makes it a lot easier to see exactly how far you are going.

If the cases are getting tight, then I keep adjusting the die to bump the shoulder until they go into the chamber easily.

Here's what I use to actually measure the amount of "bump" or shoulder setback. It is what most Benchrest shooters use. I take a short piece of old barrel and run the chamber reamer in until it cuts the shoulder area. That is all the gauge you need. You simply put the fired case in the gauge and measure the total length of the case and gauge combined. Record the measurement. With this little gizmo you can measure as little .001" shoulder bump.

http://i73.photobucket.com/albums/i239/ray928/gauge.jpg

http://i73.photobucket.com/albums/i239/ray928/gauge001.jpg

Ray

Ray,

I see what you're saying. It looks like Stoney Point actually sells a bushing for such a purpose. Midway retails them for $7.69.

You could ask a gunsmith, or anyone who has access to a lathe, to make you a "widget". This is a short piece of barrel with the neck and shoulder cut in it. Insert the case, measure the OAL of widget and case, then bump and re-measure.