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Old April 3, 2014, 01:29 PM   #50
F. Guffey
Senior Member
 
Join Date: July 18, 2008
Posts: 7,249
Quote:
Brian, you're right. The only official "name" for the measurement is an "alpha-numeric character". It's the X with a circle around it in SAAMI's chamber drawings for "headspace." The corresponding measurement on the cartridge drawing has a pyramid shaped triangle on that part of the cartridge it its drawing for the "reference diameter." Both can be seen in:
Finally, the circle with the X, something like an old RR crossing sign?

Head space, the circle with the X is used on the chamber drawing, I can only guess it will take years for you reloaders to look for the explanations of symbols used. The symbol for head space is the circle with the X, symbol is absent on the case drawing. The circle , round hole (used to find measure from) has a B, the B is for basic.

Back to the diameter of the round hole does not matter as long as the reolader understands the hole is used as a comparator.

Quote:
jwrowland77 Bart, It's funny
and getting funnier.

F. Guffey
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