Datum Line 22-250

[cdupuy]

Saami is not working, anyone have the Dimension for the Datum Line of the 22-250 Remington.

 

[Steve Nash]

22-250

1.578"

Steve

 

[cdupuy]

1.578"

Steve

Thanks Steve guess I also need the Diameter at that measurement so I may turn a Die to measure with.

 

[Richard]

SAMMI spec

1.5749 min
1.5849 max

.347 datum line on shoulder

Richard Brensing

 

[Boyd Allen]

I have found that SAAMI prints cannot be viewed using Firefox. I have to use Internet Explorer.
Try opening this using IE
http://www.saami.org/PubResources/CC_Drawings/Rifle/22-250 Remington.pdf

 

[cdupuy]

1.5749 min
1.5849 max

.347 datum line on shoulder

Richard Brensing

Thanks Richard that was what I was looking for.

 

[cdupuy]

I have found that SAAMI prints cannot be viewed using Firefox. I have to use Internet Explorer.
Try opening this using IE
http://www.saami.org/PubResources/CC_Drawings/Rifle/22-250 Remington.pdf

That worked like a charm Boyd thank you, now to the Lathe.

 

[cdupuy]

Ok the Tool is finished, measured the fired Lapua cases and the Tikka's chamber is .004 short of the SAAMI min spec. Sure would hate to stretch those Lapua cases more than the .002 that new cases measure.
Clarence.

 

[Dusty Stevens]

If its not in spec id send it back

 

[CMaier]

measure the chamber,NOT the fired case.

Ok the Tool is finished, measured the fired Lapua cases and the Tikka's chamber is .004 short of the SAAMI min spec. Sure would hate to stretch those Lapua cases more than the .002 that new cases measure.
Clarence.

 

[F. Guffey]

Saami is not working, anyone have the Dimension for the Datum Line of the 22-250 Remington.

I have no Infatuation with head space. When using a datum/round hole when measuring the length of a case from the shoulder/datum to the case head any round hole will work if it is being used as a comparator. When the round hole/datum is used with SAAMI specifications the datum/round hole must be perfect in diameter and the edge must not have a radius. There are some that want a case friendly datum, I don’t, I want a sharp case cutting edge; the sharp edge locates the ‘measure from’.

Then there is ‘zero’, I am the fan of standards and transfers. The tool used to measure the length of the case can be adjusted to zero with a standard, a head space gage is a standard and it can be used as a transfer. When measuring the case length from a datum to the case head the tool must be zeroed if SAAMI specifications are going to be used.

F. Guffey