Ed - I was sent some 525gr. Lyman's along with some wads and 9.3" bullets for testing, from a friend in Alberta. As yet, I've not tried the Lyman slugs, but have some loaded for testing in 2 3/4" hulls. They are cast of WW metal and weigh 506gr. Av. They do fit perfectly inside a Red WW field wad. From the looks of them, I think I may also have to buy that mould for my own use. They might 'convert' me from round balls for my camp 'bear' gun - might! The round balls in WW metal are almost unstopable and somewhat heaveir than the Lyman slug. Alan M. says the Lyman is very accurate in his side by side 12 as in 3" to 4" at 50 yards. It certainly looks promising and is very easily loaded.