Originally Posted by
Duelist
A 5” barrel on a revolver, especially one running an auto cartridge like the .45 ACP, is significantly longer than a 5” semi auto barrel. The semiauto barrel includes the chamber. The revolver chamber being in the cylinder, to get a length dimension to compare with the semiauto, you’re going to have to measure from the back of the chamber in the cylinder to the muzzle. I expected your 5” N frame to run fastest, because it is so much longer in the barrel.
Barrels run at different speeds. The Sig running slower might be a result of the barrel length, or wear, or machining differences, or a combination of things.