Early navy arms uberti made 1873 in 45 Colt.
At about my witts end with this thing!
Bought this a few montha ago, the bore is great but had some leading build up about 1/3rd the way up from the chamber (24&1/2inch barrel). Got that cleaned out.
Slugged the bore, .450, did this 3 times to confirm. Checked a uberti twist rate chart that states the 45 colt at .442-.450 with a 1 in 16 twist for there rifles.u
Been using a lyman 452664 boolit sized at .452, and some older speer swc at .452 moly coated.
Loads have been 4-6grns trail boss, 5-6.5 bullseye, and 5-8grns unique. Winchester brass and neck sized only.
All loads shot from sandbags at 40 meters (chicken silhouette) and 50 meters (pig silhouette).
So far none of these will group less than 7 inches if you get that lucky to get them on paper. Sights are a brass bead front, marbles tang sight rear.
Have examined for leading and have not found any traces, muzzle crown is fine, no loose spots in the barrel, cleaning or slugging everything goes through it tight.
Sights are tight.
Two different shooter off the sandbags with the same results!
So at a loss as to why??? What am I missing or doing???
Working with my marlin 1895 cb in 45-70 and any change load wise and it lets you know right away.