my CZ 452 in 22 LR, has a 25 inch barrel on it, and they make one with a 28 inch barrel on it..

I don't think it helps velocity, nor does it seem to hinder it..

a 22 Mag wouldn't be any real difference...

fast powders burn up in the barrel long before everything gets to the muzzle...

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez