80 meters is not that long a distance for an overwatch position I would think.
But, then again, I've never been through Sniper Training, so what do I know?
80 meters is short range for military squad or platoon engagement, because there usually is a lot of support fire at least available, if not already involved (HMG, marksman, mortar, infantry combat vehicle). Sniper comes in hand at much much longer range. On the other hand, 80 meters is in the same order of mangnitude than JFK assassination, the Beltway sniper and Yaponshik hit.
Sniper rifles felt more substantial in prior editions with their damage ratings so much higher than they are now. Now there are stock BRs doing the same damage as a stock Barret 121. I know I'm not the only one with this gripe, I've read others wondering as well. It seems like that wonky 3rd to 4th edition formula was used on the damage code of the sniper rifles, but other weapons just arbitrarily changed their codes to fall in line.
Battle riffles have a 7P damage value (AP -1 or -2) ; the Barret 121 is 9P (AP -4). Seems significant enough as a difference to me.
Most RPG and video games has sniper rifles doing more damage because they don't handle properly the effect of an aimed round into the chest. IRL, a lot of sniper rifles use exactly the same ammo as battle riffles (though .338 Lapua Magnum have been getting more and more common). The differences are, a sniper rifle have optimum accuracy on the first shot and retain it, and the sniper himself usually take the time to properly aim. A rifleman hitting by luck would end with about the same amount of metal arriving at a similar speed.
In my (very) humble opinion, the problem with SR rules is the range table that make it way too easy for an average shooter to hit a target at long range. The rules makes it quite easy to hit two separate targets at 200 meters with a stock assault riffle, under 3 seconds. Past a certain distance, you should be forced to take some Aim actions. Sniper rifle aren't more deadly because they are more powerful. They are because they can hit in a few shots when other weapons would require you to empty several magazines spreading bullets in the same direction.