To me, "tactical" means killing people as the primary use. I don't think it means a police-sniper type of use on maybe only one individual bad guy, compared to the need to defend one's home against a group of looters. I would not figure on a bolt action rifle for that purpose.
Since the odds are against "humping through the boonies" with a heavy load, the actual weight of a civilian's tactical rifle is less important than might otherwise be the case.
As you know, there are many semi-auto rifles of .223 or .308 from which to choose.
, Art