limited
There are limits to iron/peep sights.
Firstly, one must have good enough vision, or corrected vision, to shoot well with same. If one is past a certain age, irons of any kind can be a real challenge,... ask me how I know. The age old rear leaf and bead/blade sight are the worst. Peeps are better, especially on longer barrels.
Secondly, light, or more correctly, lack of same, will make use of irons difficult in dawn and dusk conditions. I would say that one gives up 20-30 minutes of hunting time daily, if using irons (10-15 minutes every AM/PM). Of course, that is often when game, especially wary bucks, are moving. The problem is amplified in thick cover and shaded/deep terrain, again, where deer may well be found.
I wonder if the "running game" shooting tests are more common in countries where shooting at driven game (boar hunts for example) is the traditional hunting style? TV allows us to see some very fine shooting by those folks. I read that U.S. hunters do not do well on driven game hunts overseas. I'm not surprised, thinking its as much a cultural thing as it is lack of skill and practice. I suspect a high percentage of the whitetails in this country are now killed from elevated blind/shoot houses at stationary animals on food plots and feeders. Shooting is typically done off a rail or other type of support. I don't see where a rifle running game test would have any correlation to the type of hunting we do here. I might agree to a stationary, kill zone size target from some type of field rest though, at say 100 yds. We are already conducting hunter ed classes in most states that includes a written test.....a shooting test could be part of that, but would add time and cost. We could have a whole separate post on that.
Lately I've hunted our early muzzleloader season with traditional, sidelock .50 cal percussion rifles. The carbine has a peep, the full size rifle, leaf and blade. Shots have all been under 50 yds, well up in the morning, seated off a knee. I could see shooting to 75 with confidence given the right conditions. Everything perfect , 100 would be feasible, but I rarely can see that far due to cover and terrain where I hunt.