6.5 Grendel vs. a 6.5BR in a short bbl

[65BR]

Wondering if anyone has an educated guess what velocity differential there might be in these two rounds, assuming a short bbl, say a 19-22"?

To my knowledge there is a 1.5 grain difference in capacity..roughly.

 

[sparks1]

My Alexander Arms 6.5 Grendel has a 19.5 " barrel

100g Hornady Interlock/BLC-2= 3000+fps
107g SMK/BLC-2 = 2950 fps
120g Sierra Pro-Hunter/BLC-2= 2840 fps

CCI450 primers,Lapua brass 8 firings on brass>no signs of any pressure Groups .5" @ 100yds. It does real well from 300yd to 600yd. Those boatails are just starting to stretch their legs.

 

[olympian]

Not enough to think twice about it or consider it as a factor in decision making.