Where do you live/hunt?
“To take it with a light round like 222 must have taken getting close, and delivering good shot placement.”
I shoot 30.30 and .270 myself but, I have a friends that has a new Ruger .204. (22.250, 25.06, .223 are pretty common guns around here)
http://www.gunblast.com/Ruger204.htm
We usually go for a neck shot not to waste a lot of meat. Close is better.
In the far West we usually count them a 5x4 etc. Right side first. Rare to get a mulie with a symmetrical rack any more.