I bought a Ruger 10-22 sporter 23 years ago. It was the most inaccurate rifle i have owned. I tried a
variety of ammo and the results were the same 3" at 50 yards on a good day. It spent the next decade at the back of the gun safe.
About 10 years ago I rediscovered it and thought I should do something with it.
I replaced the factory barrel with a Green Mountain Barrel. I modified the trigger and sear to get the
trigger pull down to around 3.5 pounds and head-spaced the bolt from .055" t0 .043". What an improvement.
The new barrel was fussy about ammo but worked well with the right ammo.
But I never liked the look of the flutes and missed the sights.
The Ruger Barrel has been sitting on my tool box in the garage now for several years. So today I took
the barrel and machined a slug that would fit in the chamber so I could measure where the rifling started.
According to Sammi specs the bullet was .060" away from the rifling when chambered. I chucked the barrel
in my lathe and I removed .090" from the breach face and the face the contacts the receiver.
The bullets now will engage the rifling by .030" when chambered.
I re-cut the extractor groove in the barrel with a slitting saw and touched it up with a file.
I removed the Green Mountain Barrel and reinstalled the factory barrel and made a trip to the range.
I can't believe the difference. The factory barrel now consistently shoots under an inch with bulk ammo.
The wind was gusting fairly hard at the range so that could have effected my accuracy.
The 10 shot group below is .900" and was shot with Federal American Eagle 40 grain.
If it wasn't for the 2 fliers it would be under 1/2".
Any one interested in a 20" sporter barrel for their 10-22 that's had a couple hundred rounds through it?
Terry
variety of ammo and the results were the same 3" at 50 yards on a good day. It spent the next decade at the back of the gun safe.
About 10 years ago I rediscovered it and thought I should do something with it.
I replaced the factory barrel with a Green Mountain Barrel. I modified the trigger and sear to get the
trigger pull down to around 3.5 pounds and head-spaced the bolt from .055" t0 .043". What an improvement.
The new barrel was fussy about ammo but worked well with the right ammo.
But I never liked the look of the flutes and missed the sights.
The Ruger Barrel has been sitting on my tool box in the garage now for several years. So today I took
the barrel and machined a slug that would fit in the chamber so I could measure where the rifling started.
According to Sammi specs the bullet was .060" away from the rifling when chambered. I chucked the barrel
in my lathe and I removed .090" from the breach face and the face the contacts the receiver.
The bullets now will engage the rifling by .030" when chambered.
I re-cut the extractor groove in the barrel with a slitting saw and touched it up with a file.
I removed the Green Mountain Barrel and reinstalled the factory barrel and made a trip to the range.
I can't believe the difference. The factory barrel now consistently shoots under an inch with bulk ammo.
The wind was gusting fairly hard at the range so that could have effected my accuracy.
The 10 shot group below is .900" and was shot with Federal American Eagle 40 grain.
If it wasn't for the 2 fliers it would be under 1/2".
Any one interested in a 20" sporter barrel for their 10-22 that's had a couple hundred rounds through it?
Terry
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But good job tweaking that old barrel up.
