I dearly wanted a New Frontier, way back when...and in .44 Special too, just like Keith's but never ran across an example I could afford...and this was back in the 70's. Too, over the years, I've come around to really liking (read: preferring) Ruger's front sight set up...that little block with a short Boughman type post on it. The New Frontiers have that elongated sight that just isn't right...beauty lies in the eyes of the beholder, so I understand some scolding on this point. That said, that Colt finish was first rate, and the color case hardening was terrific. Never having owned a center-fire however, I can't speak to their accuracy.
I do own a 7-1/2" SAA in .45 Colt that's wonderfully accurate with standard loads (`250 gr FPRN slugs backed with 8.5 gr of Unique). Mine is a 3rd gen gun with a good to excellent trigger, and glory be...throws those big ash cans right on top of the front sight post with my hold at 25 yds.
Thinking it'd be a good candidate for an add'l cylinder in .45 ACP, I found one at a local gun show, fitted it myself, and had an equally accurate sub load. With 230 gr LSWC or FMJ's, it prints ~3" lower at 25 yds than the bigger original military type 250's. Looking at it, it seems just right with that half moon front sight and no Eliason type adj. rear, but I was darned lucky to find one that shot to the sights.
Later, just a few years ago in fact, I found a .22 LR New Frontier with the add'l .22 Mag cylinder, languishing in our town pawn shop. I traded off a Sig P220 for it, well worn, and I had a shootable New Frontier. It's nice, prettier than the Ruger equivalent Single Six, even with that long sloping front sight blade, and the color case hardening is a knock-out. But I'll add that it's not as accurate with either cylinder as a number of Single Sixes we've had here.
Here are the pics, the 2nd saddled up with a Tom Threepersons holster I made up.....Best Regards, Rod