OK, I've come up with this, and want to make sure that it makes sense.
4.3 grains of Titegroup seems to work well...for plinking purposes with...
200 grain Lead SWC
230 grain hardball
230 grain Rainier plateds
200 grain Rainier flat point plateds
Does this make sense?
UPDATE: Today, I visited the range and shot this charge with the 200 grain Lead SWC rounds, the 230 grain hardballs, and the 230 grain Rainiers. All worked wonderfully in the following:
1. Wilson Combat KZ45 with 18.5 lb spring.
2. Norinco, 18.5 lb spring
3. Para LTC with 20 lb spring.
Cases are a tad dirty, but ok. WOOT!