Originally posted by Ponyboy
Quoted: Someone told me that you need a special Sub-Sonic barrel to shoot the sub-sonic ammo? Any truth to this, or can you use your standard 10/22 barrel?
No truth to this whatsoever......
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Actually, there are 3 kinds of "subsonic" ammo I know of--the Long Rifle loaded to lower velocities, the CB and CB long rounds, and the Aguila Super Sniper Subsonic. The Subsonic designated Long Rifle rounds along with the CB's are generally VERY quiet out of a long barrel gun (but not so quiet out of a pistol)--I shoot them out of a Rem. 572 pump and they are about as noisy as an airgun. Out of my 10/22 they are a little louder (maybe a function of the powder gasses behind the round?).
The Aguila (as I understand it--I have yet to buy and shoot any) is basically a VERY heavy (read: Long) bullet in a .22 Short sized case--so the overall length is about the same as a Long Rifle.
So, the Ruger's twist rate (I believe it is about 1 turn in 16") is too slow to stabilize the longer/heavier round. The same thing happens when you try to fire 68+ grain rounds in a 1 in 12" twist AR--they tumble (a pic below). It just so happens that the AR in 1 in 9" twist is an excellent stabilizer for the Aguila SSS round--so people report good/excellent accuracy out of an AR with a .22 LR conversion in it, and less accuracy out of a stock .22.
Pic--68 grain bullets at 25 yards (full auto) out of a 1 in 12" twist FNC (it did fine with the few 55 grain bullets we had that day)--