Having shot the H&G #68 SWC for years in my 1911, these shapes CAN be very reliable. As has been said, they must be reloaded correctly and tested in YOUR gun (don't load up a couple of thousand rounds, only to find out they won't feed). With those hard-cast #68s, the key was to leave about 1/32 inch of lead showing above the case mouth*, and of course a good taper crimp. These loads were very reliable and super accurate with 5.3 gr. of 231.
*OAL, in this case, was not the critical factor, it was that little bit of lead sticking up out of the case.