Only tried 231 once withe the Berry's 185 HBRN. To much unburnt powder I switched to Bulleye and it worked well. Accurate and no unburnt powder, but left the gun dirty. I switched to Vihtavouri N310 and have never looked back.
Gun - Les Baer Premier II
Bullet - Berry's 185 HBRN
Case - Winchester or Starline
Powder - N310
OAL - 1.250
4.5 gr. at 725 FPS, 134 PF, 11 lb variable spring
5.0 gr. at 800 FPS, 148 PF, 13 lb variable spring
If I did'nt use N310, I would use Bullseye. Even though it leaves the gun dirty, it's easy to clean. At these low pressures I would rather have a lot of "soot" instead a bunch of unburnt powder getting into all the little hiding places in a 1911.