zupatun
Well-Known Member
Went to do load development with the 308 using win brass, Federal 210 large primers and 165gr interbonds and loaded with Varget. Temps were from 90 to 93F outside. 450ft above sea level. Chrono data was taken by a ProChrono set up 5 feet away from the muzzle.
Kevin Cram of Montour County Rifles installed the 26" Broughton 5.5contour 5C barrel and trued everything up. Bell and Carlson Medalist stock bedded with Devcon and a home-made Kydex cheek rest.
I have got to get a better portable setup. My plastic table is kinda rickety and on the rocks where I'm shooting it's hard to find a spot where it isn't solidly placed...it's also narrow so I used a rear monopod...needless to say I had to work to keep myself, the table and crosshairs from moving...other problem was I left my chairs at the house (40 miles away)...so we had to drive my Jeep up to the back of my table and sit on the bumper--every time my boy gets up it throws off my sight picture etc...needless to say groups up to 2MOA were the worst and around 1moa the best...no optimal for testing, but at least all the shots were made in the same condition.
The groups settled down at 44.5gr and the second at 46.9gr.
the lower group had an average of 2773fps and and ES and Sd of 35 and 16.7.
The group at 46.9 had an average of 2882 and ES and SD of 37 and 16.4 respectively.
Primers for the higher load were cratered a little, but no more than the Federal factory 165gr hunting rounds I used to sight things in. In fact the factory rounds leave some ejector hole marks on the brass and the signs on the 46.9gr of Varget were less than the 165gr factory rounds from Federal--just beginning to show...
Velocities seem high...
I used 4 shot groups.
My Tikka used to like 44.5gr of Varget, but I didn't have any Chrono data.
Matt
Kevin Cram of Montour County Rifles installed the 26" Broughton 5.5contour 5C barrel and trued everything up. Bell and Carlson Medalist stock bedded with Devcon and a home-made Kydex cheek rest.
I have got to get a better portable setup. My plastic table is kinda rickety and on the rocks where I'm shooting it's hard to find a spot where it isn't solidly placed...it's also narrow so I used a rear monopod...needless to say I had to work to keep myself, the table and crosshairs from moving...other problem was I left my chairs at the house (40 miles away)...so we had to drive my Jeep up to the back of my table and sit on the bumper--every time my boy gets up it throws off my sight picture etc...needless to say groups up to 2MOA were the worst and around 1moa the best...no optimal for testing, but at least all the shots were made in the same condition.
The groups settled down at 44.5gr and the second at 46.9gr.
the lower group had an average of 2773fps and and ES and Sd of 35 and 16.7.
The group at 46.9 had an average of 2882 and ES and SD of 37 and 16.4 respectively.
Primers for the higher load were cratered a little, but no more than the Federal factory 165gr hunting rounds I used to sight things in. In fact the factory rounds leave some ejector hole marks on the brass and the signs on the 46.9gr of Varget were less than the 165gr factory rounds from Federal--just beginning to show...
Velocities seem high...
I used 4 shot groups.
My Tikka used to like 44.5gr of Varget, but I didn't have any Chrono data.
Matt
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