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They don't clean until the groups start to open up.Hmmm, I wonder what the benchresters do.
If a gun is shot clean it doesn't shoot as well as if it's been shot 5-10 times before.
I was looking this up a while back. They go to the range the day before and test before a competition. If it shoots good the box it up and get ready for the next day. As @AndyinEverson stated about older muzzies the same goes with the fouling gunk in their bench rest rifles.
You are stupid to enter a match with a clean bore.
Edit: (1-28-17)
If you shoot with a clean bore then you need to for accuracys sake always shoot with a clean bore. If you decide to go against that logic and realize that metal like cast iron works well when it's not super clean then you can go shoot a hundred rounds and see how the pattern does. At some point yes, it will be dirty enough that your groups open but that could be after 200 rounds+.
My Remington 700SPS with handloads that are .025" from lands shoots damn good without cleaning. it does better than I can do (9 months ago when I stopped shooting for the summer). Precise ammo and a light trigger + good barrel means good shots. I have probably 150 rounds without cleaning so far.
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