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Old January 24, 2007, 10:10 PM   #1
pdt1793db
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Caliper Question HELP!!!!

Ok this might seem like a dumb question but I just got a Caliper from Frankford Arsenal that is digital and measures mm/inches. I measure a Winchester FMJ 230gr at 20.07mm and .003 inches my Lyman Reloading manual says that same round should be OAL of 1.275''. Second item measured a Winchester .45ACP casing -0.374 inches and 0.06mm my Lyman manual says case lenth should be .898. I then drew out my caliper to those lengths and cannot figure out what .45ACP round is that long. My question is did I buy the wrong caliper? Is there a formula I am not using? What am I doing wrong? Thanks
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Old January 24, 2007, 10:22 PM   #2
kkb
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Quote:
... Second item measured a Winchester .45ACP casing -0.374 inches ...
Do you need to "zero" the caliper?
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Old January 25, 2007, 07:19 AM   #3
XD-Guy
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kkb is right it needs to be zeroed in. Just push the button that says zero
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Old January 25, 2007, 07:21 AM   #4
arkie2
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+1 on what KKB said. My digital calipers have a zero button. Yours should also. Close them up all the way then hold the zero button til it says 0 and see if that doesn't help.
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Old January 25, 2007, 07:41 AM   #5
JohnLizCas
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calipers

Perhaps you used the wrong part of the dial on the calipers. Mine has two sets of numbers (one metric), the inner circle in English measurements
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Old January 25, 2007, 07:43 AM   #6
JohnLizCas
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calipers

Never mind. I just reread the post and saw the word digital
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Old January 25, 2007, 12:43 PM   #7
Zippy06
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OAL indicates Over all length.
That is "bullet seated" in the brass.
Oh. And reset to zero.
Er. What the other guys said.
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Old January 25, 2007, 11:40 PM   #8
James A. Mullins
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The 1.275 is the overall length the loaded case should be. Yes you need to rezero the calipers. Most load books give you the max case length in both mm and inch.
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