I went to Issaquah range.
The wind was calm, but it was packed... on a week day.
The place had been remodeled.
I was there ~ 2:30 to ~ 3:30
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Addendum to range report:
I usually do not work on Rem700 actions [I like M98s and Ruger #1s], but
last month I put together some parts:
1) Rem700 22-250 for $180 at gunshow, took off the stock and barrel.
2) Krieger 6mmBRX 1 in 8" twist barrel with Harrell brake $100 at a forum
3) Choate Ultimate Sniper stock $40 at gun show
4) IOR 2.5x10x42, illuminated, second focal plane, MP-8 Dot reticule, 1/2
mil hatch, 1/2 moa target turrets $600 on a forum
5) IOR tactical steel rings came with the scope
6) Harris swivel bi-pod mounted on the rifle, lying around my house
7) B-Square Weaver Bubble Bore Level $14 SWFA
8) EGW Picatinny Rail 1 Piece Scope Mount $40 SWFA
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$374 rifle + $600 scope = $974 in materials
I cut off the 3" of shot out throat on the used barrel.
I put a 2365" pin gauge in the bore and dialed in the 4 jaw and the
spider of my PM1236 lathe.
I cut a 6mmBR chamber with my custom .272" neck reamer.
I cut threads, bolt head relief, and a diameter for recoil lug on the
barrel.
I loaded up some Lapua 6mmBR brass with H335 and 87 gr Vmax moly bullets
It weighs 13.2 pounds with rings
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A) Remington short action
Choate ultimate sniper stock with lead filled pistol grip
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
IOR 2.5x10x42, illuminated, second focal plane, MP-8 Dot reticule, 1/2
mil hatch, 1/2 mill target turrets, scope
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.
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
*87 gr Vmax moly*
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]
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average = 0.94" with the flyer, 0.78" without the flyer.
B)
VZ24 action
260 Rem, 22" Douglas long chambered #3 taper 3 pound barrel
VZ24 stock with barrel channel milled out but no epoxy
Weaver #45 and #46 two piece steel scope mounts with Devcon Steel
putty
under the mounts and Loctite 242 on the threads. Burris Low tactical
rings with 6 screws on the cap and a bolt on the Weaver rail.
IOR 2.5x10x42 scope with MP-8 1/2 mili rad reticule in first focal plane
and moa turrets. Rubber tube extensions on both ends of the scope. Scope
center is 1.9" above bore center.
100 gr Nosler Ballistic Tip moly coated # 26100 bullet moly coated ,
45.0 gr canister IMR4895,
2.940" over all length, almost no insertion of the bullet into the neck,
due to the short bullet and long throat.
Quickload prediction 61,328 psi 3261 fps
chronographs as 3,236 fps
0.99" 3 shot group at 100 yards, still perfectly sighted in on third
trip to the range.
What did I learn?
A) The 260 will shoot well when the Copper is cleaned out. It stays
sighted in.
B) The IOR scope I bought yesterday has a very different line width on
the reticle.
C) I confirmed my convictions that heavy guns and light bullets on
windless days make small groups.
The Sinclair bullet comparator on granite surface plate show with the
shoulder of the case in the 30 cal bullet ogive hole:
2.180" resized RP brass from Sav 99
2.195" virgin Lapua brass
2.204" fired brass from Rem700.
What does it all mean?
I made the Rem700 .008" too deep.
I resized the RP brass .015" too short.