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January 4, 2021, 02:14 PM | #1 |
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Is a scratched ring normal in a bolt action rimfire?
I have a Remington 581S 22 rimfire bolt action rifle.
With a borescope the rifling and crown look good. There is a 360 degree ring of scratches just past the start of the rifling in the throat area of the barrel. Attached photo is looking from throat towards muzzle. Is this normal in a 22? Thanks. Last edited by MissSkeeter; January 4, 2021 at 02:19 PM. |
January 4, 2021, 03:42 PM | #2 |
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Sounds like the reamer needs replacing (or they failed to clean it regularly).
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January 4, 2021, 06:47 PM | #3 |
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From another forum, the likely cause is using CCI Stingers.
The cases from Stingers is 0.010" longer than conventional 22LR cases. That is likely the cause of the ring of scratches just into the rifling in the throat. I ordered a new barrel for $60 to see if that will improve the accuracy. The Remington 581S has a reputation for good accuracy and I have not seen it with this rifle. |
January 4, 2021, 07:10 PM | #4 | |
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January 4, 2021, 08:04 PM | #5 |
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Concur, brass won't scratch steel. Now I'm wondering if it's lead build up?
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January 5, 2021, 01:00 AM | #6 |
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That looks like there was something on the reamer pilot that scratched the bore. If nickel plating on brass cases scratched the bore, it would be visible up to the ring you mention as well.
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January 5, 2021, 03:52 AM | #7 |
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Those aren't scratches in the chamber/throat. That is a lead and carbon ring which commonly forms just in front of the case mouth of 22LR ammo.
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January 5, 2021, 11:05 AM | #8 |
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Here is another photo from a different perspective.
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January 5, 2021, 10:32 PM | #9 |
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If you could get a better focus on that last shot, it would help. To my eye, it just looks like the throat was scored badly by a reamer run in too fast or with too little lubrication. A way to tell is with light firelapping. Clean the bore as thoroughly as you can. Take maybe five standard-velocity rounds and roll the bullets between two flat pieces of steel with some 400-grit silicone compound lapping compound to embed them and then fire them, reclean, and see if you can see where the abrasive started to take the peaks of the scored area down. You can repeat that until the scored grooves are gone or close to it, then switch to finer compounds to polish it a bit. Then see how it shoots for you.
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January 5, 2021, 10:57 PM | #10 | |
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January 5, 2021, 10:57 PM | #11 |
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Yes that is the consensus among gunsmiths in another forum.
Stinger case would not scratch rings in throat (brass case on steel). Ring of scratches likely reamer drill was dull or coolant flow was low or interrupted, it would cause work hardening of the chip which appears to have hung up on the drill for a few turns. That Remington581S had poor accuracy since I bought it new in the 1980s... I just ordered a new 581S barrel, so hopefully that will help. I live in Alaska so will not be shooting until snowmelts and it warms up (-15F today). |
January 7, 2021, 10:47 PM | #12 | |
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