I certainly HOPE you were referring to a 22 long rifle.
If not, my answer could be WAY off. Some of the super magnum center fire rifles are known to start loosing accuracy in as little as several hundred rounds. Of course, those are extreme examples of VERY hot shooting rifles. Even a normal high power could be expected to get several thousand rounds before suffering accuracy.
serri,
Your rifle will last a very long time with regular maintenence. But I do not recommend the use of a bore brush or an uncoated rod for cleaning. A good soaking with bore solvent and the use of patches will be all thats nessesary to keep it clean.
I have 3 rifles that are over 40 years old (.22s) and they are still going strong.
With proper care you will probably wear out before your rifle.
I have shot old WW1 era rimfires and have found them generally very accurate. I own an old pre-War Mauser Mm 410b and it groups 1/4" at 50m - but not as good as this when I shoot it!
The book by Sam Fadala ('The Book of the Twenty-two') quotes a barrel life of several hundred thousand rounds. C.S.Landis in 'Hunting with the .22' mentions a similarly large figure. I assume this is using regular velocity ammo - but then these are all one really needs for small-game hunting at realistic ranges.
Bullets of a lighter weight shed their velocity more rapidly and regular velocity/subsonics are usually more accurate. But I digress. In practice you will never wear out a rimfire. If you do wear it out through shooting, and not through improper cleaning practices, then you are richer than I am to be able to afford all that ammo!
I know of one old Savage Anschultz that was bought new in the 50's and it has been shot a lot since then. It's owner has won more 3 position and dewar matches with it than he can remember. It has won several other type smallbore matches over the years.
It would take a good size truck to haul all the ammo it has fired.
Accoring to it's owner it is more accurate now than when it was new.
I agree with most of the answers above. I know of one championship barrel that's been "shot out" 3 times by previous owners, but it still keeps winning in the current owner's skilled hands. You're more likely to wear out the barrel by cleaning than by shooting.
Thanks for the info, my question was about a .22lr, i always clean the barrel after each shooting session, 100 rounds aprox, to prevent rust, i dont figure that a rimfire barrel may be so accurate after been used for so long time.
Improper cleaning with a rod and brush will destroy the accuracy far sooner than shooting it will. Lots of people ONLY clean when a 22 begins to loose it's accuracy, and then sparingly.
You are right, thanks, i clean my barrel with a fishing nylon to pull cleaning patches from the bolt area, never with a cleaning rod, but now i will do that only when i feel that accurazy is bad or after 500+ round, thanks for the advise.
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