Looking at the VihtaVuori website, with their free reloading data, it looks like 310 might be a better choice for light loads with the 185gr bullets. Even though I have not yet found a better powder for light loads in 45ACP than Bullseye, the 310 is closer to the burn rate of Bullseye. Are you having leading problems with that light load of Bullseye you were using? If you normally clean your guns between range sessions, powder residue should not be a problem unless it causes malfunctions. I have no problems using Bullseye in my 1911s or Glocks. I have put over 500rds in a session thru my guns, without cleaning. Let us know how the VihtaVouri shoots.
Savage