Nosler 7 vs. 8 manual question

hoyt-6190

Beginner
Feb 25, 2015
60
1
So I noticed that regarding the 257 weatherby the Nosler manual #7 states COAL of 3.25" and manual #8 now shows a COAL of 3.209. Does anyone have any idea as to what may have changed to shorten that COAL?
 
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