I never even tried learning to use aperture rear sights until my late 50's - should have started 40 years earlier - they are awesome, compared to the standard barrel mounted iron sights. Had read in Finn Aargaard's writings, however, about his low powered Weaver scope on his second 375 H&H - he said he made many shots with it that would not have been possible with his previous rifle, when the game is in deep shadow, even on a bright day. I will never get to shoot at 1% of the game that he did, so I prefer to follow his lead. His first 375 H&H, by the way, had a fixed rear aperture sight - he dispensed with the barrel mounted iron rear sights from the get go.