6BR First range trip (Borden BRM/Brux/Jewel/A-5/Phoenix)

[Boatschool02]

All,
I chose 6mmBR for my first custom build because of its "inherent" accuracy.
I'd read stories of load testing without a single group exceeding 1/2 MOA.
Thought I'd post this quick pic in support of such claims.
Berger 68 / CCI 450 / 0.020 off hard jam / 0.002 NT / New Lapua cases. Necks turned down 0.0015.
Switching wind @ 12mph. Four different powders across four light to medium loads.
The worst two groups (#10 & #15) are +/- 0.385".
Pretty pleased given than my rifle was configured (8.8 Twist) around the Berger 95 VLD... which is showing real promise as well.
Will post a full write-up once I have everything dialed in.
I've learned so much through the collected knowledge of this forum.
My sincere thanks to all.
V/r,
Luke

BZ to Greg Taylor and Speedy.



95VLD-H / CCI 450 / New Lapua / Varget / 29.8 grains @ 100 yards.

 

[Phil]

VERY Nice, but without pictures of the rifle, It never happened................


Phil.

 

[Boatschool02]

Borden BRM LBRPLE 6.5x284 mini-port pinned lug with 20MOA pic rail
McMillan A-5 adjustable cheekpiece with benchrest tang and Anschutz rail
Jewel Benchrest blueprinted
Nightforce 12-42
Ken Farrell rings
30" Brux 0.236 HV 8.8 Twist
JGS reamers (0.055" FB)
Wilson inline seater cut with reamer
Phoenix Bipod

Project Goal: Learn the finer points of reloading with option to rebarrel for FTR.

 

[swd]

Looks great, I'd go shoot 600 F Open as is and have fun!

 

[snert]

Dat's purty!

 

[Phil]

Other than the bolt being on the wrong side...... I don`t see a darn thing wrong with it.

Shoot the barrel off of it and enjoy.

Phil.

 

[Mulligan]

Great shooting and darn fine looking rifle for a wrong handed rig.
CW

 

[Boatschool02]

95VLD-H/Varget/CCI450 Seating depth testing results at 200 yards.
Averaged 0.63" across seven groups the previous day working up from 29.2 to 31 grains.
Went with a medium load of 30.0 based on a scatter plot of velocities at each charge and vertical groupings on target.
I know many have reported running as high as 31.7 with the 95 grain class, but I have no interest in pushing the limits just yet.
Throwing out the obvious no-go-zone (-.024" seating depth) this day came in at 0.61" average across eight groups.
Interestingly enough, the worst group had the best ES of 5.
From the driver's perspective, I've got quite a bit of learning to do in the transition from sling to bipod. Have ordered a custom rear bag, but won't have it for several weeks. Also need to look into a mirage shade of some sort. At 42x from the bipod, I'm confident that I'm responsible for 1/8-1/4" of the groups area of uncertainty at 200 yards. Still working to refine NPA and repeatably balance out forces on the stock. This realization makes it hard to assign too much significance to any of the groups within 1/8-1/4" of the average across both days.
Next purchase is probably a borescope so I can see what's going on inside and remove another variable.
Thanks to all for the kind words above.

 

[Boatschool02]

Interesting 95VLD/Varget charge weight testing results at 200 yards.
Top row charges are "mild" but the vertical variance between groups is non existent.
Velocity is +/- 2910 between 29.9 and 30.1.
30.3 to 30.5 and 30.9 to 31.1 display the same vertical shifts across two different tests.