A couple of things to remember if you are going to use a case as a bore guide.
Make sure the case makes contact with the end of the chamber, many 45/70 cases are pretty short and your 1885 havexa longer chamber.
The other us to make sure the hole is centered and the bored hoke is very smooth.
As far as cleaning goes, just clean right now with some G96 or other cleaner that will remove the powder fouling- I prefer Mercury Quicksilver Power Tune or Amzoil Foaming Engine Cleaner from a boat shop or Canadian Tire. After about 50 rounds run some Wipeout in it over night and that will give you an idea if you are building up too much copper in the bore .
A quick look at the muzzle may also tell you about how much copper is building up , but looks don't areas tell the whole story about what the rifles is actually doing as far as copper build up goes.
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't! 
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