Bore brush and cleaning help for my surplus rifles

I have a 7.7 jap type 99, two mosins, and a chilean Mauser, I need to know what kind of bore brushes I should use. With my mosin being it's 7.62 I've been using my issued brushes but I'm worried about the other to, also are there any perticular products I should use for my rifles to keep the bore nice?
 
Mosins fire a .310 bullet, but their bores usually "slug" at .311 to .314. The british 303 brush should work well (.313) or you can use an 8mm but it is a bit tight. Most chilian mausers are 7mm and will take a different brush.
 
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