My first 5 shots at 50yds went into 2in but then the group started to open up laterally. I found that the rear sight was loose in the dovetail, wedged it in place and got back in business.With the Swiss loads I found that running a bronze brush through the bore every 20 shots restored accuracy but with 777 I fired 50 rounds without cleaning and accuracy was still good enough for CAS type matches.

I thought that the COL might be a little short for the 1873 but the rounds all fed perfectly.
While fixing the rear sight I noticed that it appears to have an adjustable leaf. There is a small screw that holds the leaf in place. Is this a Winchester original? It certainly looks like it has been on the rifle a long time.

The front sight is worn down by scabbard wear and the rear notch is pretty small for my eyesight so I think I will replace them with my favorite Beech/Marbles tang combination before I carry on load development, but at least Big Lube has turned my 1873 from a Gunbroker candidate into a keeper.
Perry Owens