Resurrecting an old thread, the safariland 44 mag speedloader will work for 45 colt. If you check cartridge dimensions you will discover the base is slightly larger for a 44 mag at .514" vs .512" for the 45 colt. I have loaded and unloaded my 45 colt using a J-S5 (44 mag) with no problems. I will order three more to have on hand.