I have never held a Sig P-227, actually I have never even seen one but I recently read that it feels exactly like the P-226 in the hand and the dimensions are either identical or very close.
The P-227 has a double stack .45 auto mag which holds ten rounds. They also make a 14 round mag which I assume is a bit longer.
I have a P227, and it is indistinguishable in feel from the P226 E2 (enhanced ergonomics, not the same as the old 226).
It actually fits and sits lower in the hand than the old P220, and has less perceived recoil IMO. I have medium to small hands and operating the controls is no problem. The trigger reach seems less than the older P220’s as well.
I haven’t had the opportunity. I have a p220.