I have sent the gun back and am looking forward to getting it back and seeing some improvement.
However, I have been shooting a long time and reloading for over 40 years so I know a little bit about the subject. I never measure a guns ability to shoot moa with me as a variable. It has been my experience with small bore 22 right on through the 30 cals that it is not unreasonable to expect a weapon to group in the 1 inch range at 100yds with the proper ammo and the shooter variable removed(bench rest), when you get up to the high 30's and 40 cals I don;t expect better than 3 inchs.
I have auto loaders that will consistently shoot 2 inches and a 45cal front loader that will shoot the 4 inch bull out of a target at 100 yds. When I shoot a 243 I expect it to be inside of 1 inch. when I pull that trigger on a deer, elk or even a squirrel I pick a "spot" not a side and I expect the bullet to hit mighty close to that spot.
There is no reason that the Rossi will not eventually shoot accurately, that I can come up with.
As forr expensive rifles, why pay the money if it will not perform? I had a squirrel hunting friend several years ago who had Kimber make him a left handed bolt action 22, cost about 1000bucks, I had a relatively cheep marling that would out shoot it (group better). However, after a couple of trips back to kimber and a new 600 buck barrel he had a real "tack driver." Simply hard to measure the group at 50 yds, just punched a hole in the paper.
With the rim fires more so than the center fires, the problem is usually with the ammo, you gotta get the right match. I have an old Remington 22 that will not keep rem and win ammo on a six inch target at 50 yds but will shoot about 1 inch with CCI mini mags.