RE: 220 Swift
I have a Ruger 77 Mark II in a .220 Swift and I love it.A few weeks ago we went deer hunting in West River SD and I brought it along to use on turkeys and coyotes. However, my buddy brought only a 223. He knew it was the absolute minimum to use on deer and only took close range broadside shots. He filled one of his tags that way but ended up losing two deer withit. Again, only broadside, close shots.
So... the last day he borrowed my 7 rem mag and I took the Swift out, knowing I'd have to limit it to close shots. I ended up filling out my last two tags with it. One shot was angling away, the other broadside, but neither were over 60 yards. Both deer fell on the spot. One had a 2 inch tall by 3 inch wide coming out and the other was the weirdest thing: no exit hole, but after I cleaned it I found a hole in the exit-side ribs big enough to put a pop can in.
It's not my first choice for deer because I wouldn't use it at longer ranges and there's not as much room for error, but it will bring 'em down in a pinch (if usedin the right circumstances). Not a huge amount of lead, but there's a lot of powder (and speed) behind it.