I've never had a rifle that liked SST. in any capacity.
Improving a barrel by lapping.
- Thread starter HappyWarrior
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I thought it was shooting 3/4 Moa in your last thread? it's a 65 year old rifle at the minimum, I seriously doubt that Fire leaping will help anything IMO, I'd put it back in the safe and preserve a piece of history
Calvin45
Well-Known Member
I'd suggest creating a "reference load" against which to measure the performance of new ones.
I recommend a flat base bullet of simple cup and core construction, a budget soft point of some ilk, in a weight guaranteed stable in your twist but not a lightweight. Load to standard coal with an old school single base powder a grain under book max ( start lower for safety etc).
Won't be the greatest load ever but guarantee won't be the worst.
Speer makes a 90 grain hotcor I believe. That's what I'd try myself.
I recommend a flat base bullet of simple cup and core construction, a budget soft point of some ilk, in a weight guaranteed stable in your twist but not a lightweight. Load to standard coal with an old school single base powder a grain under book max ( start lower for safety etc).
Won't be the greatest load ever but guarantee won't be the worst.
Speer makes a 90 grain hotcor I believe. That's what I'd try myself.
You are correct Sir, the 12 twist would barley stabilize 90 grainers so his group with the 95's reflects that
With one exception, thanks for the comments.
The bore really was nasty, pre lapping borescope.
first I went conservative and used the 400 & 800 grits. No change.
Then I loaded up 20 with the 220 grit.
The drill went shoot 5 and clean. Shoot 5 Winchester white box 80 gr factory SPs.
Repeat and Repeat.
center after 5
lower right after 10
lower left 15.
Scoping the bore now still shows rough but I'll follow with all grits.
The cross hatching is greatly reduced and the longitudinal scratches from the 220 grit lapping show.
Just may save the old girl !
Now I have to find another 722 to put that 243 AI barrel on !
The bore really was nasty, pre lapping borescope.
first I went conservative and used the 400 & 800 grits. No change.
Then I loaded up 20 with the 220 grit.
The drill went shoot 5 and clean. Shoot 5 Winchester white box 80 gr factory SPs.
Repeat and Repeat.
center after 5
lower right after 10
lower left 15.
Scoping the bore now still shows rough but I'll follow with all grits.
The cross hatching is greatly reduced and the longitudinal scratches from the 220 grit lapping show.
Just may save the old girl !
Now I have to find another 722 to put that 243 AI barrel on !
Looks like it's cleaning the tube up but the consistent pattern of Horizontal stringing looks like shooter discipline or terrible trigger, if that's the case it looks like a 3/4 Moa rifle
Betarider
Well-Known Member
Morgantown has a lot of shooters
D
Deleted member 107796
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Here's my 722 in 257roberts, made in 1950 and sporting a handcrafted wooden stock and leather sling that my friend's grandfather made. Old Weaver K4 scope. When my friend gave it to me, the barrel looked furry as you looked down it. I'd hate to borescope this thing but it still shoots sub MOA with most anything 117 -120gn. My 100gn loads can get a bit squirrely with velocity.
257 is the most expensive 722 out there.
I have had the same rifle setup the in the late 80's scope and all. It had the same problem too, cccovbra is correct on the twist issue. I shot one deer with it then sold it. The best 95 grn. bullet that I could get to shoot was the Sierra 95grn. pro hunter Rnd nose. (shorter than other 95's)
The 722 244 will shoot 100 gr bullets plenty accurate to kill any deer within it's kill envelope.
The 722 244 myth was scripted by the gun writers paid off at the annual OLIN farms bash that both JOC and Keith commented on in their later writings.
Wine, women etc were all in ample supply for the OLIN shills.
The 244 is a better cartridge than the 243 for reasons that P.O. explained and why his 243 AI is among the best medium bore 6mm.
Today with the Barnes 80 gr 6mm, the 244 is deadly.
The 722 244 myth was scripted by the gun writers paid off at the annual OLIN farms bash that both JOC and Keith commented on in their later writings.
Wine, women etc were all in ample supply for the OLIN shills.
The 244 is a better cartridge than the 243 for reasons that P.O. explained and why his 243 AI is among the best medium bore 6mm.
Today with the Barnes 80 gr 6mm, the 244 is deadly.
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Nomosendero
Well-Known Member
I used the Tubbs Final Finish on a rough bore 25-06 Sendero that was a copper factory. It worked as advertised.
Huh, Well why aren't you shooting 100's then? it sure looked like it was shooting those 95's with pinpoint accuracy, and it's no myth 12 twist is to slow for the 95's and up, you can run that in any modern day twist calculator and find the same answer
New 100gr 6mm Match Bullet — More Velocity Than 105/108
Long-range benchresters have had great success with the Berger 108gr match bullet, introduced in 2007. Given the popularity of its tangent-ogive 108, Berger has been developing a shorter, lighter version, which can shoot faster than the 108 in small cartridges such as the 6mmBR, 6mmAR (6-6.5 Grendel), and 6 PPC. The new 6mm 100-grainer will be very similar to the 108. The 100 has the same ogive curve and boat-tail as the 108 but has a shorter OAL and shorter bearing surface (0.368″ vs. 0.409″). A minimum twist rate of 1:8" is recommended for the new 100 — same as for the 108. In a 6BR rifle, the 100-grainer's reduced bearing surface, combined with reduced mass, should enable Berger's new 100gr 6mm bullet to fly 50-70 fps faster than the 108 (with charges of equal pressure).
| Caliber | 6 mm |
|---|---|
| Bullet Weight | 90 Grain |
| Product Line | Target |
| G1 BC | 0.409 |
| G7 BC | 0.21 |
| G7 Form Factor | 1.037 |
| Minimum Twist (or faster) | 1:10" |
| Ogive Style | Tangent |
| Base Style | Boat Tail |
