I really like 231/HP-38 and use it for IDPA loads because it groups well in ammo that meets the required power factor.
However, for the best accuracy at low pressure/velocity for Bullseye matches (we only shoot at 20 yards), Bullseye is my choice --- by far!
At low pressure, Bullseye burns more completely that 231/HP-38 leaving less unburned flakes in the action and, from my testing with my target .45's, it produces less shot-to-shot velocity variation.
JMHO - YRMV
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