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Old November 26, 2019, 01:59 PM   #30
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 7,723
Are your barrel's bore, groove and chamber dimensions plus powder, primer and case lots, the same as those used to develop the load data you reference?

If not, there'll be a wide range of velocity numbers. Several of us shooting the same rifle and ammo will get different average velocities. Sometimes over 50 fps.
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