I've got a Burris 2.75x20mm on a Yugo M48A and a Mosin M38. Granted they're not really scout rifles, but it's a scout scope. I have no problem with 300 yards+ with it.I certainly don't agree that the RGS is a <300 rifle. But with a 3 power scout scope you can own the riflemans quarter mile. 500 yards.
Heck, iron sighted rifles are capable of that. A little magnification just makes it a little easier.
OP, you have an awesome rifle that your challenge is to be as good as. You can make hits as far out as you are capable of. The rifle is not a limitation.
I don't really care for the iron sights on the gsr. I wish it came with irons like the garand has. I have burris scope on mine and have no problem with 200 yard shots. Thinking of getting a scout scope in the near future.