Re: Scope for my FV-SR to get out too 300-400 yards?
For 300-400 yards, you're going to need a scope with a lot of adjustment to get out to 400 yards and maintain a 50 yard zero.
On my 10/22 with an 18" Kidd barrel (I'm going from memory here) and a 50 yard zero it's +7 mins to get to 100, then + another 20 mins to get to 200, another +22 mins to get to 300. I'd imagine that it would be another 22-25 mins to get to 400.
So, if I'm adding right, you need a scope with about 100 mins of adjustment to get to 300. Or maybe 80 mins with a 20 MOA base.