I think I understand. Bob wonders what accuracy he can expect with a rifle with only a front blade.
I would think accuracy would be much better than a smoothbore, at any range past 25 yards, I'd say.
I have 2 flip-up rear sights on my hunting rifle, Bob and if all are laying down, sighting is taken over the rear sight boss
placing the front blade and bead in the middle of the barrel. I've only shot it this way to 50yards and I would say the
loss in accuracy is about double normal group size. Since normal grouping at that range is 1/2" to 1", groups with just
the front sight, is about 2" to 2 1/2", still quite good. I would expect to easily be able to hunt deer or moose/elk or black
bear to 100yards without having to use a rear sight.
Hope that answers your question.
Of course, I might have missed the question as well. It happens.
OR - he is asking about accuracy with a smoothbore at 100yards using a peep sight in his glasses. I would suggest your
accuracy at 75 yards might be good enough for deer, but actual testing & load development would be VERY necessary.