Great gun!
On my wish list. Interested in selling?
I have several Model 600s, in .222 Rem, .243 Win, and .308 Win. Great guns! They are not bench guns. They are not target guns. They are hunting guns, made to be carried alot and shot a little.
The very light barrel contour gets warm very fast. The more you shoot, the bigger the groups get, generally. I prefer 3 shot groups as a measure for these rifles, face it, how often are you going to get shots 4 or 5 if the first three didn't connect?
1.5" groups are good for these rifles. Sometimes they will do better, but you can't count on it. You can tailor handloads, and maybe do better, but MOA is not something you can guarantee, especially with these light carbines. In .350, you got a real bruiser there. Play with different bullet weights, you might find one that the rifle really loves, or you might not. A couple of mine go almost MOA, with the right loads, and another only about 1.5", but that one puts 150, 165, and 180gr bullets about an inch apart, point of impact shift at 100yds!
The only problem with your rifle is that .358 Win and .35 Wheland match or exceed your rifles velocity with the 250's in 22' barrelled rifles currently in production.
Its not a problem with his rifle!
The .358 Win, loaded top end matches the .350 Mag (barely), but needs a 22 inch barrel to do what the .350 does with the Model 600's 18.5 inch tube!
The .35 Whelen will beat the .350 by about 100fps with the 250gr bullet, but also needs a 22" tube to do it, and doesn't fit in a short action. So the rifle must be longer and heavier than the model 600 to perform as well (.358) or slightly better (.35 Whelen).