Rio Shotshell Hulls 12 Gauge features
Hulls come in many gauges, colors, lengths, crimps and brass heights. While these differences are apparent from the outside, many hull differences are internal.
From Ballistic Products: Primer notice: Like Fiocchi, Rio’s proprietary primer is made to a metric specification. The result is that the primer measures approximately 0.001″ larger than standard U.S. primers. Therefore, plan on reloading them with Fiocchi or Rio primers- otherwise a U.S. primer will be loose in the primer pocket.