Brent
Did you make a typo here ? up top you are asking for 2 MOA at 200yards ....thats 4"? ...... further down you say 2" at 100 yards
we know the shooter here is top notch but 2MOA with black is stretching most lever guns - I have done it a few times and sneaked inside it on a couple of occasions - shooting dirty with a grease boolit .....clean between shots has been a no deal for me from the start - never gonna be king of the long range game but I have done plenty of shooting good enough for what you are planning .
I dont reckon any of the powders we have today are even close to as clean burning as the good stuff they had in the old days (the way we load and shoot) ...........
Most blokes on here are using what I regard as gentle / light compression - your load says no to that - but I dont reckon you have near enough lube in that load to shoot dirty.
With a grease boolit its the lube grooves that make all the difference - try a pure lube disk an eigth inch thick - thats gonna need a good overpowder wad as well as your LDPE boolit wad
My uberti 76 will walk shots if I get the shot cadence wrong (common problem with lever guns - specially long barrels with full mag) - can rip three or four out of it quick - by then the bear or the gunner is done for I spose......
Theres a feller on the CAS city forum does some fine shooting with lever guns "Dusty Texian" you might get a tip or two from him that will help - I believe he has shot PP in levers ...................