Some do and some don't. I own mostly Sakos which do not....but one did! My Tikka 7Mag took about 30 rounds and it was done. Usually working up a good hunting load and matching bullets and powder will do the trick. I clean after 9 rounds at first then use Wipe Out every 20 or so and it's a done deal. If you keep getting alot of copper out of the barrel keep shooting, Wipeouting and brushing with Butch's until it stops. No barrel is perfect and some are better than others IMHO. This is really a common sense thing. Regards, Rick.