Propellant used in tested factory loads is reported to be produced by PB Clermont, as marketed by Ramshot, which is the propellant brand used in the ball-powder SMc handloads used in this study. Since these propellants are all chemically very similar, differing only in burn speed, mostly as a result of differences in graunules size, significant differences in barrel heating cannot be attributed to differences in propellant, at least not among the laods using Ramshot propellants.