[pmulcahy11b]

I think I see what's going here: the confusion between a silencer and a suppressor.

A silencer is designed to seriously knock down the sound of a weapon firing, and it generally does that with a combination of subsonic ammunition and a special device, the silencer, which works by both/or a set of baffles which use the firing gasses and wipes that physically touch the round going down the silencer to slow it, to contain firing gasses and stop the bullet from exiting the barrel at supersonic velocity. These will reduce range, penetration, and damage. Heavier bullets and steel-cored bullets are often used to compensate for this.

A suppressor does not "silence" a weapon (no silencer actually makes a weapon sound like it does in the movies, BTW) -- it dampens most of the muzzle blast, and while it reduces noise very little, can cause confusion as to where the shot came from when heard from a distance. The primary reason for the use of a suppressor is to eliminate firing signature. It would not reduce range, damage, or penetration, though they do tend to wear out eventually, degrading accuracy in the process.