In early nieve loading daze, did ladder using only SPMP, bc published data didn't specify! And cartridge is 'MAGNUM'!!!! IKR!!!! Was OK, but w/ H110 got some very high fps, but no high pressure signs. This was S&W mod 66 4" barrel. Used 2400, Unique, H110, & Titegroup; 158 gr GDHP. Hope...