Gunsmithing 7.5 x 55 Swiss FIELD OR NO-GO GAUGE

[lrgrendel]

If any one has one of the above could you measure it using the Hornady Head Space tool with the D400 slieve. Both would even be better!
Many thanks.

 

[DAVETOOLEY]

That number wouldn't be a reliable comparison to your sleeve. They are not that consistent.

 

[lrgrendel]

What’s the difference between measuring a fired case and a no go gauge?

 

[lrgrendel]

So I did what I’m asking for with.

30-06 fired case measured with a C375 bushing. 2.045”
Field gauge measured with a C375 bushing. 2.052”

8mm Mauser fired case with a D400 bushing. 1.860”
Field gauge measured with a D400 bushing. 1.864”

Explain again why it can’t be done???

 

[Ledzep]

A teeeny tiny change in the depth of the chamfer cut on the D400 bushing will give a big enough variance in measured length to cause your measurements to mean nothing.

If someone measured the Gauge with their D400 bushing then sent the SAME bushing to you it'd be okay. Called "Comparator" for that reason. used to compare, not necessarily give outright measurements.

 

[lrgrendel]

Not looking for 0.0000000000000001” accuracy.

If anyone happens to have either please PM me.

Thanks

 

[DAVETOOLEY]

I just made up gauging to accurately measure bullet ogive to base measurements on ammo for a single caliber. All measure within .003" on the same bullet at .263" diameter. It is not as easy as buying a $49.95 set from Amazon.

A comparator bushing does not equal a precision ring gage.
YMMV