These aren’t bullets, they’re monsters. A good deal of US Model 1842 Muskets were rifled post-production during the US Ordnance Department’s pursuit of a modern rifle design. To suit their update, a massive Burton style “Minie” ball was developed and issued with them, seeing service in both theaters of the American Civil War. My reproductions are cast on a custom mold by Brooks Tru-Bore and weigh nominally 720gr. They are .685″ in diameter. The design is taken from the “Small Arms 1856” book. I fire these through an original M1861 Plymouth Navy Rifle using 68gr of 1 or 1.5Fg Swiss but, please only use a load that is safe for you, and for your weapon!