Beautiful engraving on the sights, Marrakai...it's really cool!

My Cogswell & Harrison 450/400 2-3/8" BPE standing sight is marked 150. The leaves are marked 250 and 350. So, in that case, was it sighted in to regulate at 150 yds? What kind of group size could be expected at that distance? It also has a flip up adjustable ladder sight that has no markings on it.

My C. W. Andrews 450/400 3-1/4" NE standing sight is 100. The leaves are marked 200 and 300. Any idea what normal group sizes would be appropriate for those sights?