that rifle might be great with a red dot. petemi is the man to ask.
Oldshooter, ya put me on the spot
First, I don't think I'd cut a .308. Mine's 22 inches, and that's probably shorter than optimum.. But, It is used as a long range rifle and I want every fps. I can get. For the same reason, I wouldn't put a red dot on it because it would cover a lot of target at three to 400 yards.
The way you plan to use the rifle, it's going to be fine short and with a red dot. I like them in close, poor light....dusk and dawn.
As I already have done with some of these, I'd use a different caliber for a shorty....the Maxi, .44, .38-55, .30-30, .45 Colt, .35 Rem, .356/.358. That's just me and how I use my rifles.
Pete