Thread: Rimfire suppressor and Rimfire specific scopes

Originally Posted by vulcannz

The supersonic crack is not a function of a can suppressor, unless you're using a full barrel suppressor which slows the bullet down before it leaves the rifle (it usually has vents along the barrel to remove gas).

So it's either faulty ammo or perhaps your martini is venting someone (I've no idea about that, maybe someone else more experienced can comment). If the suppressor was doing something to slow the bullet down it'd likely get blown off.

Without more detail, it is possible barrel length may be a factor here. Modern 22LR ammo seems to get peak velocity at around 10-12 inches down the barrel and after that the friction in the rifling is enough that the pressure behind it is not quite enough to maintain acceleration. Some of the high velocity ammo is only a hundred or so FPS above super sonic so it would not take much to slow it down.