This bullet is correct for the .43 Spanish Remington Rolling Block, and similar cartridges using a .439" bullet. It is not suitable for the .43 Spanish Reformado, a rare cartridge that uses a slightly larger bullet.
Lyman, .439" diameter, 370 grain bullet mold, single cavity, steel blocks only. These precision mold blocks are made in the U.S.A. and tend to cost a bit more than other brands. They are nice quality. Special steel alloy mold blocks hold heat, for even casting temperature. Steel blocks almost never wear out, if properly stored. Blocks are made in one size, cut with a single cavity for large bullets. Mold handles are sold separately. Use large Lyman handles on all current production molds.
Be sure to order #LYMAN-TP-251 Lyman Top Punch #251 for your Lyman or RCBS luber sizer press.
Be sure to order #LYMAN-HI-439 Lyman .439" Sizing Die for your Lyman or RCBS luber sizer press.