Per BAT their Igniter mag port is cut to handle 3.180 and they're a fair bit less expensive and still top notch BAT quality.
I have two BAT actions, HRPIC & Igniter, and one Kelbly. They both make a top shelf product but BAT is only about a 15-20 drive to their shop for me so they're my first pick, AND, I had the pleasure of getting a full tour of their shop and how they make their receivers from start to finish when I was there awhile back. They're really nice folks and have a very impressive operation. I was a BAT fan before but after that I can't imagine ever buying anything other than a BAT action again.