I know each barrel is different, simply wondering what velocity I should expect from a 26.5" 40XB barrel, marked 7.62 NATO, a 1 in 13" twist?
NOT looking for MAX here simply wondering what the Experienced .308 shooters here have found.
Just started loading Berger 175's the Long Range Target bullets #30420. As Berger shows they are acceptable for a 1 in 13 twist.
OCL into the lands was measured at 2.980". So i'm thinking a LONG throat ...as I see 2.810" or 2.80" as the "book" OCL .
My first load, 44.0 of Varget, WW brass, 210M @ 2.835" OCL sent five into .297" In a nice round hole. Velocity was 2691 fps with an ES of 8 fps.
3400' elev 48 degs.
I've read 45.0 grs of Varget with the various 175's seems to be a standard. So I'm going to go up in .2 gr incremensts to 45.0 and see where it takes me.
As an aside......I also loaded a few more with 44.0 of Varget, but sent the OCL out towards the lands, -.040" off . All three of those groups were in the .7" area and strung horizontally.
So possibly this gun likes them on the SHORT side. Is a jump of .145" unusual? I assume it's acceptable?
Any guidance appreciated.
FN in MT
NOT looking for MAX here simply wondering what the Experienced .308 shooters here have found.
Just started loading Berger 175's the Long Range Target bullets #30420. As Berger shows they are acceptable for a 1 in 13 twist.
OCL into the lands was measured at 2.980". So i'm thinking a LONG throat ...as I see 2.810" or 2.80" as the "book" OCL .
My first load, 44.0 of Varget, WW brass, 210M @ 2.835" OCL sent five into .297" In a nice round hole. Velocity was 2691 fps with an ES of 8 fps.
3400' elev 48 degs.
I've read 45.0 grs of Varget with the various 175's seems to be a standard. So I'm going to go up in .2 gr incremensts to 45.0 and see where it takes me.
As an aside......I also loaded a few more with 44.0 of Varget, but sent the OCL out towards the lands, -.040" off . All three of those groups were in the .7" area and strung horizontally.
So possibly this gun likes them on the SHORT side. Is a jump of .145" unusual? I assume it's acceptable?
Any guidance appreciated.
FN in MT
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