Forster's LS Jaws are required when using the 38-40 WCF, 25 ACP, 22 Hornet, 378 Weatherby Magnum, 45-70, 45-90 (and others using that case base), 416 Rigby, 348 Winchester, 218 Bee and 7.62x54mm Rimmed Russian with the Co-Ax Press.