Choosing a Lyman bullet mould involves selecting the gun type and the caliber of bullet listed on the company website, as well as using the information in the description to match the designed functionality to intended use. This information includes the caliber's original gun, its optimal speed, its ballistic coefficient, its accuracy and its applications. Typical uses for bullets are practice, competition, reenactment, hunting or personal protection.
Lyman Products Corporation provides mould blocks for rifles, pistols, black powder, shotgun slugs and muzzleloader round balls. The company produces single-cavity moulds for 0.45- and .050-caliber bullets and double-cavity moulds for all other calibers. The bullet moulds are manufactured from steel, as opposed to the aluminum or cast iron used by other brands. This eliminates a major issue in mould choice by combining the durability of cast iron with the lighter weight of aluminum.
Another consideration in selecting a mould is the configuration of its sprue cutter and plate. Sprue is the excess molten metal emitted from the cavity during the pour. The device holds any sprue and cuts it away from the bullet after cooling. All Lyman moulds include sprue cutters and plates consisting of precision-machined thick steel that supports the hot metal without distortion and separates the sprue cleanly.