Are you right handed?

The gun could be crossfiring with those light loads, and the right barrel not showing it on the paper, or plate, because of the way you're holding it. Crossfiring is common with light loads in vintage S X Ss, but all I ever saw did it with both barrels, to varying degrees.

Try a heavier load in that barrel at about 1165 fps and see what it does to the pattern placement. If you determine it truly is just that barrel crossfiring you may have to use different loadings in each one to regulate it.


May God bless America and those who defend her.