I built my second 6mmBR and went to the range

[Clark]

[Used $180 with shot out barrel and old wood stock] Remington short action
[$40 used] Choate ultimate sniper stock with lead filled pistol grip
[ $100 with shot out throat and brake, cut off 4' of throat]Krieger 22' 6mmBR bull barrel 1 in 8' twist, with shot out throat
chopped off until a .2365' pin gauge fit the bore tight.
Harrell recoil compensator
IOR tactical steel rings
[Used $600 with rings and covers ]IOR 2.5x10x42, illuminated, second focal plane, MP-8 Dot reticule, 1/2
mil hatch, 1/2 mill target turrets, scope
[ new $15] B-Square Weaver Bubble Bore Level
I had a Harris swivel bi-pod mounted on the rifle, but I used a medium
DogGoneGood shooting bag and wedge, because of the Choate stock forend
geometry.

[Used] Lapua 6mmBR brass fire formed to 6mmBRX, sold used to me, and I resized
to fit the chamber I cut ~ .007' longer than normal 6mmBR brass.
Win small rifle primers
33 gr H335
2.290' OAL [jammed into the lands, the bullet will seat that much
further anyway]
Quickload predicts 69,191 psi, 3,161 fps with 2,393 psi start pressure.
Quickload predicts 73,896 psi, 3188 fps with 5,393 psi start pressure.
It is jammed into the lands with a small bullet, so the truth will
likely be somewhere in between.
I did not chronograph, as I forgot to bring the tri pod.

~ 1' 2 shots 50 yards, fouling shots, did not retrieve the target, I
bore sighted to within ~ 4 moa at the range.

1.03' 5 shot group at 100 yards
0.55' 5 shot group at 100 yards
1.14' 5 shot group at 100 yards [would have been 0.34', if not for one
flyer]
0.96' 5 shot group at 100 yards
1.04' 4 shot group at 100 yards [out of ammo, with 2 rounds left that
would not chamber]
----------------------------------------------
average = 0.94'

 

[AckleymanII]

'chopped off until a .2365' pin gauge fit the bore tight'.

Practically everybody will miss this very helpful tid bit.'

Clark, what are you planning to do with this beast?

 

[Clark]

This second was for practice with the newest lathe.
That worked out, as every screw up was also with the realization that I needed to cut off more throat anyway.

The first one was a 1917 Sav99 take down with a Shilen 1 in 14' twist benchrest take off barrel. That was for novelty.

I have another 6mm barrel, a NEW select match Shilen 1 in 10 twist that I will put build in time for the 2010 rodent hunt.

I want to build a 7mmMag and 257RAI in time for the 2009 ruminant hunt, and I needed some practice right away.

What I learned was that the #10 Copper wire [that is wrapped as a gimbal around the breech in the 4 jaw chuck] is not getting enough traction. I want to make a right side of headstock spider that grips at 8 points.

 

[Clark]

see if I post a pic