RE: 870 Barrel Switching
I never said not to check it, I check all my guns before any hunt, even my single shots. Just saying the whole point behind the cantilever barrel is that you don't need to re-zero the scope when switching barrels. This is something that came about when people were using reciever mounted scopes and removable barrels.
I see what you are saying, but the scope is mounted directly to the barrel, simply removing it and putting it back should not change anything. Now whether the gun is accurate to begin with is a whole different story. I know way too many guys with cantilever mount systems that work great to say there is something wrong with the system. It's really not much different than the H&R I own, the scope is mounted directly to the barrel and the the barrel hinges from the reciever. Same with many break open high end pellet guns.
Unless I am mistaken the Tar hunt guns and others like it do not use a cantilever mount, they use a reciever mount and pin the barrel so it doesn't move. They better be more accurate, they cost between twice and 4 times as much.
If the cantilever mounts didn't hold zero or were not that accurate I highly doubt they would sell that well. I live in a shotgun only state so pretty much everyone I know uses a shotgun of some sort. It's absolutely no different than a slug barrel with iron sights, except it has optics instead.
Paul