John, why would you want to do that? I see no purpose for such a load.
If you are loading for pests, why not use a 110gr. hollow point? Also one company (Speer?) used to, and may still, make a bullet called the 'plinker.' This was basically a half-jacketed bullet, weighed 100gr., and was devastating on pests.
Your suggestion seems somewhat dangerous to me, as the light bullet combined with a slow powder may cause pressure fluctuations.
Hope this helps, Walt