j104wd: I'm not so sure about the oal - my books show a 1.275 oal for the 45 so that may not be that much difference, but it may. Some folk load the swc slugs far enough out so the leading band just touches the rifling as long as chambering is positive.
Whenever I load a swc slug in the 45 acp case I have to make sure the case mouth crimps at the leading edge of the front band; I use a taper crimp and haven't had any jams. HTH. Mikey.