I've always liked the Marlin model 60. I helped a friend with his a while back, got it all cleaned up and shooting well. It shoots nice little nickel-sized groups at 25 yards.
I have two of them myself, but never really sat down with sandbags to see how they do. I started tinkering with one, and found accuracy seriously lacking, like 2" to 3" shotgun patterns at 25 yards. I tried several different types of ammo, checked everything I could think of, no better. Then I pulled out the other rifle for comparison and the groups from it were just as bad!
2" @25yards is ok for plinking tin cans across the yard, but I really expected better. It's funny, I do a google search and find all kinds of threads and such, but mostly I find people talking about how their rifle will shoot "minute of angle all day long with bulk ammo". Now I know talk like that is exaggerated baloney, but what kind of real accuracy should a person expect from a cheap .22 rifle?