Disclosed herein are suppressors for use with firearms or the like, and methods of making and using such suppressors. The suppressor may include a body defining a central bore extending from a proximal end to a distal end about a central longitudinal axis. The body includes a proximal body segment defining a proximal bore segment configured to receive a distal end of a barrel of a firearm, and a distal body segment defining a distal bore segment. The body includes a wall having an inner surface defining the bore, and having an outer surface. The wall defines at least one channel extending through the wall from the inner surface in the proximal bore segment to the outer surface in the distal body segment. Some examples include a canted helical portion extending helically around a cylindrical body portion. Some examples include one or more cooling bores spaced from the central bore.