Scotch-Brite/oil or solvent on a jag is really good at slicking up bores that might show some neglect.

Good news about the .45.

With slippery oil patches, mine (42" GM Barrel) liked both 75gr. 3F and 85gr. 2F with .445" balls and 10 ounce denim(.022"). Both loads chronographed 2,240fps.

I like to develop loads for both 3F and 2F in my rifles as sometimes I run out of one of them.

With water based lubed for target shooting, dropping those loads by 10gr. worked as well. The vel. for those was in the 1,750fps range. There was a big change in vel. with the winter windshield washer fluid and a bit of Neetsfoot oil(about 1oz per 6 oz. WWWF). We add the oil just to slow the evapouration in the summer time. We call it WWWF+Oil.

It is used on precut patches, shaken then applied to them in a tin (Sucrets tins work), or a Track's snuff, fire-starting tool or glasses cases. Any water proof tin can be used. Speer bullet boxes in the smaller sizes also work - but are bright yellow.