O-rings

[Hobie1]

I was out to the range the other day and talked to a guy who was putting o-rings on his Anschutz rifle barrel. He said it was to tune the barrel harmonics. He had 5-6 rings evenly spaced down the barrel to the stock. Hmm I said.
So, I looked it up and found this for starters:

Suhl homemade barrel tuner - Rimfire Shooting

Yet another thing to try. I don't know but for the cost I'm going to give it a go.

Hobie

 

[Foxtrot]

Barrel harmonics are actually vibrations in the rifle AND barrel material that start the moment the trigger is pulled and the firing pin strikes the primer. All of the vibrations are translated to and through the barrel, and outward along the barrel.

The theory goes, basically; An arc of movment of the barrel is created by the vibrations, causing a sort of whip type of action. As a rule the less mass a barrel has (the thinner it is), the more it is affected by the vibrations, this is the reason a "heavy" barrel seems to shoot more consistently. A shorter barrel of the same diameter will also have less amplitude to its arc of movement. As you "tune" the barrel with the O-rings you are changing the vibrational length causing the vibrational arc, or circular vibrations, of the barrel to get smaller and smaller and thus having less effect on accuracy.

Generally, barrels below 20 inches or so don't benefit all that much from "tuning" but give it a try.

 

[bearandoldman]

The theory behind barrel tuning is to get the bullet to leave the barrel on the node or minimum movement of the barrel consistently. If you use an ammo that is very consistent in velocity and tune the barrel that system will work.