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Practice with that Buckhorn sight! 30-40yds is quite attainable with irons. Peep sights are great for longer distances, but moving target aquisition is much more difficult. That rifle is capable of blasting pop cans at 100yds all day long with the sights it has. -Steve
Lyman makes some very high quality sights. Olympic quality. Williams are basically knockoffs that are not as good.You also might think of a Tang sight. It would look very classic and would be nice quality also.http://www.midwayusa.com/viewProduct/?productNumber=131854http://www.brownells.com/.aspx/sid=52056/pid=8835/sku/Henry_Lever_Action__22S_L_LR____22_Mag