Good starting load for 4064 pushing 175s in 308?

[targaflorio]

i just loaded 60 175 SMKs over 4064 to compare to varget. 41.5 to 43 grs in a 20" gas gun. does anyone load less than 41.5 grs pushing 175s?
I have not chrono'd all my Varget loads yet, but going up from 43.3 my SDs and ESs went up as well...

Winchester brass with BR2 primers.

 

[dek]

Re: Good starting load for 4064 pushing 175s in 308?

Sierra manual, vers 4, indicates 42.2 gr 4064 as the accuracy load with the 175 gr bullet, est velocity 2550 fps.

 

[bohem]

Re: Good starting load for 4064 pushing 175s in 308?

From a bolt gun, I start at 42gr and work up in 0.3gr increments. A long tube bolt action usually ends up in the 43.5-44.5gr range.

I'd start at 41.5 in the gasser and load to Mag length.