Re: mini 14
The "Tactical" Mini is just a standard Mini-14 with a black synthetic stock and a flash hider...nothing special or "enhanced" about the rifle itself versus the standard Mini. They will achieve (more or less) the same accuracy as any rack-grade Mini (which usually equates to between 2-3MOA with decent ammo). They are more than accurate enough for coyote use out to 100yds or so, but you aren't going to win any accuracy contests.
As for decent ammo...any US-made commercial ammo should work well, but like any rifle, YMMV. Hornady TAP, BH, or Federal will likely get you the best accuracy with 69gr and lighter bullets (IIRC, the Mini has a 1:9 twist so I wouldn't go any heavier than the 69gr). For plinking, Federal XM193 or its commercial equivalent 55gr stuff will do fine.
Finally, they eject out to the side for the most part just like the vast majority of semi-auto centerfire rifles on the market these days.