Ok, I have made some preliminary tests with my 200gr .33WCF bullets.
These were sized .332, and seated just above the top grease groove.
The Lyman plain-base bullets were tested with TrailBoss powder, and, at 19gr, would hit an inch low at 50 yards, using the battle site, and had about a 4 inch spread.
The RCBS gas-check bullets were tested with H4895, and at 40gr were hitting in the X ring, at 50 yards using the battle site, with a 3 inch spread.
I am waiting for more bullets to continue testing, but the RCBS shows a great deal of promise.