WW-231 is a very high energy powder so it typically takes a very light charge as you have noted. It shoot ok in 45 Colt but not as well as others so a change in powder may be in order.
Unique is a fine choice for 45 Colt. In the 255 gr boolit loads 8.0 gr gave me single digit standard deviation. Prolly need to bump that up to 8.5 or 9.0 gr for a 200 gr boolit.
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