shotshell reloading supplies. When choosing a shotgun powder, you will find that there is a lot of variety, largely changing based on the shot load. In general, heavier shot loads will require a slower burn rate, as it takes longer to sufficiently accelerate a heavy shot. shotgun reloading supplies. If a fast-burning powder is ignited behind a heavy load, it could lead to excessive pressures, damaging the firearm and potentially causing injury. At the other end of the spectrum, a slow burning powder behind a light load, such as a bird shot, may not give enough power for sufficient energy and velocity. shotgun reloading supplies, shotgun reloading, shotgun reloading powder, shotgun shell reloading supplies