Miller, another great post. Thanks to my friend King for backing up what Miller says. The recommendation of "slow burn powders", such as 7625, for general purpose 12 gauge loads for composite barrel guns, was started by the publication of 7625 loads for ten gauge loads for composite guns. The authors of such articles, directed at ten gauge shooters, were advocating 7625 for heavy shot loads in large bore guns at safe pressures, a correct use for that particular powder. As Miller has told us, 7625 and similar slower burning powders are not correct for 12 gauge loads with 7/8 ounce or less of shot at low velocities. Thanks, Miller.
