Based upon the provided chart, 18gr = #350 and a 19 = #361. You then look for available bushings in between.
If you take one of the available intermediate bushings (#354/#357), start with the lighter of the two (#354). Use a decent scale and track the powder drops as you "load" multiple "prototype shells" until a reliable average develops from your machine, based upon how you manipulate the tool...
on MY 366, the 348 bushing drops around 18.4 grs of titegroup and that is a very stout load ( 1 1/8oz 7.5's, win primer) good all the way to the parking lot also the published load data for titegroup at 18.4 grs gives a pressure of 11.4K psi so check your loads carefully.
edgar
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