Oklahoma is rifle, and yes, there are inherent risks with rifle rounds. It makes it even more important to get to know your hunting neighbors, so someone doesn't shoot towards a known stand site. Like one of the posters said earlier, "its a trigger management issue", and that's proven every year when I hear of people "mistakenly" shoot another hunter with a shotgun while turkey hunting. It could certainly happen with rifles...
Concerning the impact on deer population and age, once again, "it's a trigger management issue". For those that can afford it, a nice rifle with a rangefinding bad boy scope is a tremendous advantage. When that 2 year old basket rack steps out of cover at 300 yds, you know it's going to likely get shot, and one doesn't have to have great hunting skills to pull this off. I believe it will impact your buck age structure unless your neighbors are serious managers.