22WMR accuracy issues....Southern Ontario groundhog hunting=right up my alley.
Hey wasa-it "SOUNDS" like your barrel might be shot-out, and I don't know enough about the model to comment on whether or not it's worth getting re-barreled. If that's even possible. Re: 22WMR accuracy-I've owned 1 Savage 93FV in that caliber, and have now shot 2 other 22WMR bolt guns. (Marlin and a CZ) I remember having 11 ammo types on hand, a 3-9X AO scope, a steady rest, no wind and a 100 yard range-the day I tried to determine whether or not my Savage was a lemon. Most expensive ammo was the Remington Accutip, but it was #2 in terms of accuracy. What I learned that day (and since) is that a 1" group with 22WMR is an accomplishment, and probably part luck. I shot maybe 20 groups that day, and maybe 2 were SUB MOA. I quickly realized that if it was even touching the outer edge of the 1" ring, that was good. Groups averaged between 1-1/4"-2" the most underwhelming around 4", confirming what I already felt about Winchester rimfire ammo. Anyhow, I decided that the 30gr. Hornady shot the best/most consistently but as decent as that ammo was, you'd get unexplained fliers that turned an otherwise promising group into a 2" affair.
The goal was a heavier-hitting rimfire for groundhogs, after a summer shooting them with 17HMR. My experience with that caliber was that it's lacklustre on a varmint of this size, and even problematic if any wind or distance is involved. I love 17HMR out west on gophers, but a big one of those is a fraction of the size of an adult/mature groundhog. I decided to give the 22WMR a try, but being mindful of it's accuracy...I kept the shots 125 yards or under, and always aimed centre mass. 22WMR always hit hard, and every groundhog I shot with it dropped. My advice-buy a bolt gun with a decent trigger, keep shots in/around 100 yards...and the 22WMR should never disappoint.
You mentioned a 22 centerfires-that's a superb idea. My experience in S. Ontario is that anywhere you can make 22WMR-amounts of noise, a .223 (for example) ought to be fine. I spent several years using a .223, then yo-yoed between that caliber, and .204 Ruger. The last 3 I shot this year were with the 204, but in previous hunts this year and last, I ran my 17 Hornet. I wouldn't recommend 17 Hornet simply because of ammo availability compared to something like .223, but for groundhogs...I've come to really believe that it's the perfect combination of power/reach/low report. Especially for the size of farms we have here.
Anyhow, as my interests changed...I sold off the 22WMR and .223, I'm down to the 17 and 204. If you were going to buy one caliber, I'd suggest .223. Ammo availability is great, but it's also a forgiving caliber to reload for if you're new to it like I was. I believe it's an inherently accurate caliber, and one most people shoot well.
From my second-last hunt, the .17 Hornet
Ever used 17 HMR? I popped a few with it and it did just fine. I love that round.