The ACP would require a moon clip I believe. What a looong distance for the bullet to travel down the cylinder before it hits the bore! lol! Akin to a 45 LC down a 460 S&W cylinder!
take care,
r1kk1
My Blackhawk runs .32 Auto just fine.
My GP100 does, as well (but I suspect thin rims would cause erratic ignition).
I generally only run hot loads in the "little guys" (.32 Auto and .32 S&W). The jump to the throat is massive. Light loads lose their gas seal, before the bullet hits the forcing cone (or, so it seems). Performance is far from ideal.
For light loads, I use .32 S&W Long or .32 H&R brass, to reduce that jump.
You may find, as I did, that some shooters are very sensitive to the concussion from this 45,000 psi cartridge. It took my wife nearly 2 years to fire full power loads without a flinch or immediate "I give up".
Now, her favorite load is 85 gr XTPs on top of 13 gr Lil' Gun in .32 H&R brass. It's a 'reduced' load, but still has plenty of bark
and bite.
When you start reloading for it, you'll have to assess your primer choice carefully. Hot loads should be using Small Rifle primers, rather than Small Pistol Mag (or standard). For hot loads, I've had good luck with H110/W296, Lil' Gun, and Alliant 2400.
RCBS .32 H&R dies are also deep enough to accept .327 Federal brass. (And was the first brand to actually ream and label their dies specifically for the .327. ...due to being part of ATK, no doubt.)