Might be interesting if the cylinders are in scale length-wise with the shorter auto pistol rounds (vs., say, a .357 cylinder). Then one in .40SW might be a neat little gun. Wonder how easy one would be to reload from a pistol magazine, thumbing them off one at a time into the cylinders...
I have several Bianchi speed stips for a .38/357mag and the 40s&w round fits perfect in one as well.