Sounds interesting
Does the .32 ACP bullet fit snugly into the sabot?
What kind of powder do you contemplate? Anything safe for a 110 gr JHP should be perfectly safe as a starting point. Be certain to count the weight of the entire sabot + bullet package. Red Dot, 700-X, Bullseye, Unique, 231 - - Any of these should get you started in the right direction.
What is your goal? Something for small game hunting?
Please keep us updated on your experiments.
Best,
Johnny