What sort of 5 shot 200 yd accuracy can you get from prone and sitting positions? (A glove and sling are OK, even jackets but no bipods or other support.) I'd like to hear what your best results are but also post what you can do on demand.
A very good prone iron sight shooter can put the vast majority of his shots into one and a quarter MOA (this would be 2.5" at 200 yards). Most top shooters think they shoot a lot better than that (e.g. "I can hold a half minute"), the truth of the matter is that the most demanding iron sight target out there is an ISSF 50m smallbore target or an ISSF 300m target. Both of them have a 1.15 MOA 10-ring. Matches consist of 60 shots. In 50m smallbore, you need to be at the very top level of Olympic ability to be able to shoot a 600 out of 600 (i.e. sixty out of sixty shots into a 1.15 MOA 10-ring).
It is "relatively straightforward" for a good topnotch shooter to shoot in the low to mid 590s (ie. 52-57 out of 60 shots into 1.15 MOA).
With 5-shot groups, group sizes will be smaller than 10, 15 or 60-shot group sizes (remember "nobody ever made a group smaller by shooting at it"). For a shooter who is capable of firing 15+ shots into 1.25 MOA, it would not be uncommon for him to often get 3/4 MOA 5-shot groups (1.5" at 200 yards) or even 1/2 MOA 5-shot groups (1" at 200 yards), though it is not something that he could count on *always* being able to do.
Sitting is a less stable position than prone. A fair to mediocre shooter will do a lot worse sitting than he will be able to do prone. Very top shooters somehow manage to shoot *nearly* as well sitting (and standing, and kneeling) as they do prone. I have no idea how they do it, it seems amazing to me.
Surprisingly a good prone shooter firing off his elbows with a glove and sling, will see very little performance improvement by going from iron sights to a scope. He's already getting nearly all of the possible aiming performance with his iron sights. Looking at the sight picture that you get with iron sights and comparing it to what you see with a 2X or 36X target scope you would find that hard to imagine, but somehow it's true...