Sigma
Ive been a Ruger fan for over 20 years and they are easily my favorite rifle, whether the older M77 or the newer M77 MKII.
The trigger may or may not need work. The older M77s have an adjustable trigger but both older and newer models are easy to rework. I use a Dremel tool and a Cratex wheel to polish up (not grind!) the mating trigger and sear parts and have ended up with some very nice triggers as a result crisp, clean, and right around 2-3/4 to 3-1/2 pounds. I do this on all my firearms, so Ruger or not makes no difference in this area.
Another thing I do to all my wood-stocked rifles is float the barrel. This chore takes about 15 minutes and requires a screwdriver, sandpaper, Magic Marker (to loop the sandpaper around), a little elbow grease, and some polyurethane to reseal the stock. Again, the factthat it is a Ruger makes no difference.
So what can you expect for accuracy at 100 yards? My old 7mm Mag M77 has always shot 0.5 3-shot groups with its preferred load of 160g Speer Grand Slams when I did my part and the wind cooperated. Even though its seen 24 years of use, it recently turned in a 0.266 group with a new load using North Fork bullets. My buddys M77 MKII will shoot 0.4 with Speer Grand Slams. The MKII VT in .22-250 I got a year ago last Christmas put 4 shots into 0.5 at 200 yards and the used M77 in .257 Roberts I got a year ago put 3 into 0.95 at 200 yards. In other words, I wouldnt worry about accuracy potential.
On the upside you get what I think are the best looking rifles around. The Rugers are known for their strength and with their one-piece bolt you will never have to worry that the bolt handle will come off as it has been known to do with two-piece bolts. The scope bases are integral to the receiver, not held in place by itty-bitty screws. A mule and two logs convinced me of just how strong this system is and, although I had a couple broken ribs after the scope and receiver got between them and a log, the scope never lost zero. No doubt in my mind that a standard mounting system would have snapped the screws. The modern M77 MKIIs have controlled-round feed and, more importantly to me, ejection. Plus there is a 3-position safety on the MKIIs. All good IMHO. Cosmetics are simple and functional, the result of Bill Rugers Not a penny for frills attitude, but as I mentioned above, the result is very pleasing to the eye - at least to mine.
Im not one to trade away a rifle that shoots and all my Rugers will be in the safe until Im too old to do anything but give them to the relatives. So go ahead and get the rifle I think you will be very pleased. You asked for opinions and that is mine.