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1 lighter bullet in a 6br/?

If you run JBM calculator, you can run the lighter bullet faster and at 300yds.
the drift will almost be the same and the drop will be less with a lighter bullet.
Slightly less recoil.
My experience across target shooting and hunting applications….. you have to use the JBM data as a starting point, but you have to shoot a bunch of both weights see what really works best.
 
Year's ago I did very well with a pair of 6brs in 10 twist. One like 80 Bergers the other 88. The 90 gr version never was quite as accurate as the 80 or 88 in those barrels. I never considered a slight drift advantage on paper a factor. You learn to equate your rifle with your flags. If one drifts 1.3 and the other 1.9 I don't think many could ever tell the difference even if they think they can. Now if you don't do flags and poke and hope I suppose on a given day it might change a point or two. I will take what groups best and trust my flags. Your gun will tell you what it likes, trust your target.
 

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