Thanks fellas.
Mehavey, I have a couple I am considering. One is offered by Taylors and Company, another is made by a fellow here in Colorado, but I don't have his information at hand. Both are "lollipop" style sights sort of like the Lyman, but they have a windage adjustment as well as elevation.
The purpose I am considering is for a lever action silhouette match at the club. 80 pound rams at 200, the other critters at 50 yard increments coming towards the firing line. The scoring includes a "hit" for full bullet strikes on the rams and pigs, which don't always topple, especially with the 357 magnum.
The cartridge I am shooting is a 357 magnum, which with no adjustments to the barrel sight hits out to 150 just fine, but the drop off at 200 is such that I have to bring two clicks to the elevator wedge on the barrel sight, and I still have elevation issues. I still go over and under at 200 with regularity, but steady for windage. I haven't settled on a cause, but the 4 or 5 foot discrepancy tells me it has to do with the shooter, not the cartridge, and the other guys suggested a tang sight would really help.
My thought would be to set the tang sight for 200, and maybe the turkeys at 150 with adjustments to sight picture to accommodate that distance, but use the barrel sight which lets me smack the chickens and pigs, and which I really like using. I mean I clobber those chickens!
What I would like to avoid is having to make an elevation adjustment to the tang sight during the course of fire. My reasoning is that the lollipop sights are not as precise as a vernier sight, and not as repeatable, and I would like to be able to "set it and forget it." This is probably the main reason I don't want to remove the barrel sight, plus it is more than adequate for pigs and chickens.
I guess the other reason is that if I remove the barrel sight, I will probably end up buying a globe and post front sight, and at some point, I just have to say "enough," you know? I really like the rifle as it is. Perhaps a little more practice on 200 yard targets will get me in form without having to resort to new sights at all.