I'll be the first to tell you, that I'm pretty hard on rugers. I've owned a bunch of ruger rifles and revolvers and all of them shot poorly. Out of all of those rugers the only one I kept was a number 3 carbine in .22hornet. I bought it second hand, so I don't know of any mods that have been done, but that little rifle will shoot with any hornet I've handled.
The trigger isn't the lightest, but is void of any creep and is about perfect for a hunting trigger. Unlike most single shots I've owned extraction has been perfect. Chambering neck sized cases is no problem. Accuracy has been good with factory ammo averaging 1.25 inches. Most plastic tipped 40gr hand loads will shoot 3/4 to one inch. The Sierra .224 40gr hornet bullet will easily do half inch groups all day in this rifle, but unfortunately Sierra hasn't produced any of those for a couple years now. Hopefully they will resume production soon before I run out of my last few.The only bullet I couldn't get her to shoot was the 35 gr vmaxes. They wouldn't do better than two inches.
While my gun isn't a number 1 it's close to it. Shorter barrel and a band on the forearm. It's pretty handy piece compared to a full size número uno.
Now I'm not suggesting to go buy a number one, but I feel that the number one is one of rugers better offerings. There's a lot of info out there on tuning these guns, so iffin you get one that doesn't shoot up to par you can always fix it. I think as fat as extraction and chambering goes they are hard to beat. IMHO function is just as important in a hunting gun as accuracy.