what are you folks are talking about? i've loaded thousands of .45 colt ammo in the last 40 years without owning a .45 colt die set; i use lyman t-c .45 acp dies with a colt shell holder. the length difference is accounted for by die adjustment.
i apologize for flaming, but perhaps before "experts" opine on something, maybe they could try it out or think it through...it ain't rocket science, folks!
i learned much over the years from trying things...sometimes they didn't work, but many times they did. reloading forums have increase the spread of tricks and techniques learned by many of us over the years and it's a shame some pass on bad info.