Re: What to get tac15 or 15i?
This is not a problem I've thought about a lot, relative to the Tac.
However, I do own an Encore with switch-barrel capability and while I do switch between muzzleloader and .308 barrels it's a bit of a pain, and I do have to switch scopes between the barrels and sight them in before use.
It forces me to go to the range more, which is often a good thing, but only if I have time in my busy schedule.
Based on this experience, my advice is that if you've got the money you should simply buy a Tac15i and a Timney trigger upgrade so you have two completely separate weapons.