Are you pulling those out of somebody's manual? My Lyman BP manual is decades old and has no .32 data.
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I picked the velocity based on the Lyman "BLACK POWDER HANDBOOK & LOADING MANUAL" although I rounded it off.
The Lyman book lists several loads for the .32 caliber roundball shooting gun.
For instance, shooting a .310 dia ball with GOEX FFFg in a 26 inch, 1:66 twist barrel gives the following muzzle velocities:
30 grains=1940
40 grains=2072
50 grains=2203
60 grains=2238
70 grains=2273
The Ballistics calculator I used is designed for roundball only and was downloaded from a link on the Muzzleloading Forum.
You might be interested in downloading the calculator:
BALLISTICS CALCULATOR LINK