red9, the .45 S&W was not obsolete at the time your T-Lock was made, so whoever did the conversion probably had a source of plentiful Schofield rounds. You might check those chambers to be sure, but an extra benefit would have been that other .45 rounds will also fit nicely in a .45 Schofield cylinder ( .45 Eley, .45 Webley, etc. ) I am currently preparing an article for the SWCA Journal on a record target shot at Bisley, ( London) by Walter Winans, using a NM #3 chambered in .45 S&W. UMC Cartridge Co., owned by Marcus Hartley, apparently had a large surplus of .45 S&W rounds in inventory and , as a marketing endeavor, attempted to create an accuray image for that round by having Winans do the target as an advertising gimmic. Ed. #15