I don't have a good reason for wanting to try this, other than the novelty and knowledge that it COULD work.  In my opinion, if you want to shoot 40S&W, buy a pistol chambered for it, or a conversion barrel (I use KKM).

I'm a long-time RCBS Rock Chucker SS user.  A few years ago, I ventured out and purchased a Dillon 550C.  In short, I love it.  Set-up took a little time, but once done, it has performed to my expectations.  I still use the RC, but the Dillon meters Longshot well and does not disappoint.  Plus, Dillon has a lifetime warranty.