308-.309 roughly, I dont have the tool to measure 3 groove rifling properly. Be aware that due to their custom nature, many of these bullets are designed for a specific purpose or firearm, and won't necessarily fit or feed as drawn in all guns of that caliber. Finally picked it up and was able to make a chamber cast, rifle is in beautiful shape for being made in 1891, all matching and even has a bunch of stock cartouches. This catalog is a record of molds I've made. Best accuracy is usually accomplished with a much closer fit, tailored to a particular firearm. Mass produced bullet molds are designed with very conservative, minimal dimensions north of the crimp groove, so that they will chamber in the great variety of firearms out there.
Minor modification to the RCBS handle may be required. RCBS handles also fit, except some newer RCBS handles have reduced diameter screw holes in somewhat erratic locations. These molds are designed to fit Lee six cavity handles. You may choose from these designs, use one of these as a basis and specify modifications, or submit a completely custom drawing electronically or by regular mail. Minor modification to the RCBS handle may be required. As new designs are ordered, they are added here. This expanding catalog contains designs that are already on file. Click on any design to view more details.
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