Siiri,
I use bbs all the time with no side effect to my barrels. When I put my rifles away for longer periods of time I always leave a little bbs in the barrel, when I get the rifle back out to shoot, sometimes months and months, I run another patch with bbs on it followed by a dry patch and go to shooting

I have several long range BR shooters that tell me they put a drop or two of bbs on a patch and run it through there barrels before shooting groups, they claim it helps with copper fouling :-\ anyway I think Ron is right for your rimfire applications I think regular old Hoppe's #9 would be just fine and cheaper also. Its only 1 deg above F here what is it up north, tomorrow is thanksgiving you and K0na_stinky ought to go out shooting, and remember Siiri 7mm-08s rule and .270s are much slower and they druel LOL

You two have a happy thanksgiving.
Wayne.