WJM1000
FNG
You know barrels are a funny thing. The first barrel I had on my .338 Big Baer was a Hart 1/10 twist and was using 147 grans of 50 BMG and getting 3275 fps. I re-barreled with a Bartlein left hand gain twist 1/10-9.25 twist and running the 300 Berger’s and getting 3185 fps with 137 grains of 50 BMG. I did go higher with the power charge, but had the best accuracy with the 137 grain load. Have you ever noticed any changes in powder charges/ velocity when changing barrels?139g of H50BMG
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