#2292155 - 07/04/08 12:17 PM
COL variance???
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Ken14
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Registered: 12/14/06
Posts: 222
Loc: Palestine,Tx
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Ok..here's one for the experts..how much variance in overall length do you consider acceptable?? I was putting togather some .25-06 this morning and for 20 rounds they did not vary more than .002. What is the general rule that you all use.?? I was using a Mitutoyo dial caliper...sorry it's all I had..
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#2292167 - 07/04/08 12:24 PM
Re: COL variance???
[Re: Ken14]
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jimmypgeorgia
Campfire Ranger
Registered: 11/28/03
Posts: 1802
Loc: Gwinnett county Georgia
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Ken, I had to buy one of the Hornady bullet comparators in order to get better data. The points on bullets are often smashed or deformed a bit, you have to measure from the bearing surface.
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#2292241 - 07/04/08 01:03 PM
Re: COL variance???
[Re: jimmypgeorgia]
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300WinMag
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Registered: 01/02/05
Posts: 553
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If you're measuring to the tip of the bullet and only getting a variance of 2/1000ths then I'd say that's excellent consistency! Keep doing whatever you been doing.
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#2292255 - 07/04/08 01:11 PM
Re: COL variance???
[Re: 300WinMag]
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selmer
Campfire Regular
Registered: 12/04/02
Posts: 460
Loc: Upper Midwest
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That's pretty good off the tip, but if you want to measure the variance in relation to the lands, get some sort of comparator, Sinclair makes a nice simple one, Stoney Point and Hornady make comparators as well.
Selmer
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#2292472 - 07/04/08 04:16 PM
Re: COL variance???
[Re: Ken14]
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5sdad
Campfire Guide
Registered: 01/22/05
Posts: 3059
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Like everyone else said - either get a Hornady/Stoney Point or one of the other comparators (I'm still not convinced that's a real word). Cartridge OAL is largely meaningless - distance to ogive can be useful. Best, John
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