Sorry, guess I need to specify the gun....For me on my 1866 the saddle ring which is far back and low on the receiver so it gets in by the web of my trigger/left hand when I grasp the stock wrist. Now on my Rossi 92 .357 Mag Puma (from Brazil 15 yrs ago or so came with saddle ring & a Puma medallion) the saddle ring clears as you noted and the ring bar on my trapdoor also is forward 'nuff to not interfer with my LH shooting.How so ? It's mounted high up on the receiver, out of the way and on the off side of your face.
I have a saddle ring on mine from the factory.....thanks for the link to the rear sight. Mine is an older Rossi (circa early 1990's) and the dovetail is metric.........how did the dovetail & new rear sight mate up on yours??? Is yours a newer gun???