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Old January 24, 2012, 09:34 PM   #5
mehavey
Senior Member
 
Join Date: June 17, 2010
Location: Virginia
Posts: 2,940
If you are talking about these items

http://www.6mmbr.com/catalog/item/1433308/977259.htm

They are superb. [Make sure to order the proper modified case case(s) when
you order the (long/skinny thing) OAL guage.]

As far as the comparator inserts go, there is one (in the set) for every caliber. They are
designed to engage the bullet at bore/lands diameter so as to get a true reading of
the proper (comparator) length of the cartridge relative to those lands. Every different
bullet design will therefore have its own different measurement.
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