It really doesn't matter how often you clean, because you will Pay for the neglect one way or the other. A rifle has two accuracy nodes, clean and fouled. My opinion, based on many years of shooting Matches and hunting, doing both cleaning and not cleaning has directed me to cleaning often. when I first started my apprenticeship as a gun smith, I mostly worked on rifles that had problems hitting anything and the owners had bad luck own expensive hunting trips. they would bring in rifles that had never been cleaned and described the problems they were having and wanted to see if i could improve or fix their favorite hunting rifle that once shot great.
This is the results of what I normally found.
1 = Badly fouled barrels.
2 = Extractor issues from not cleaning the bolt.
3 = Chambering issues with dirty and fouled chambers. (Some were fouled so badly that chambering a round became very difficult because of carbon build up)
4 = Action screws were loose, (No Torque)
5 = barrels were setting in filth and barrel was rusty and pitted.
6 = scope mounting screws were not tight.
7 = Stocks were pushing on the barrels on one side.
8 = triggers were dirty and needed cleaning to function properly.
This was generally what I found wrong with every rifle that was brought in with problems, and was a direct result of not being taken care of. In my mind Not Cleaning the bore is one of the signs of neglect. When cleaning a rifle, you often find other problems that could be corrected and would have led to failures At an inopportune time.
There is definitely and accuracy loss that many cant afford to give up. A 1 MOA rifle off a bench is no where near the same as a 1 MOA offhand shot with no rest and a rifle capable of 1 MOA with the combined with the shooter skills and the conditions can add up to 2 or 3 MOA fast, so the reason to get the most accuracy from your weapon is very important when you consider the expense and trouble we go through to have a successful hunt.
To me, Cleaning a barrel is a good chance to find and get ahead of any other problem and resolve it before they bite you.
As a side note: many of the guys that though there rifles were the problem, though I was some kind of wizard because their rifles had never shot that good sense they bought it. and when I explained that all I did was to thoroughly cleaned it, and reminded them that if they did a little maintenance it would stay that way.
A weapon that is cleaned and maintained will not let you down.
To me there is no reason not to clean any weapon, the frequency is up to the conditions and the person.
Just my opinion
J E CUSTOM