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Old January 26, 2013, 04:14 PM   #19
Senior Member
Join Date: September 8, 2007
Location: Mississippi
Posts: 13,377
Oh ok, see I always wondered that. I thought it was length like in 45-70, 45-90, 45-110. So its the charge.
Length is part of it because bp always fills the case with no air space but yeah the numbers are bullet size and powder charge.
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