32 S&W Long loads and fires just fine in my Colt Bisley.
It does come out with a swelled case of course.
Resizing eliminates that and reloads again.
But..that resizing of the bulged case does overwork it quite a bit and I only got 2 or 3 reloads per case. Still not too bad.
OTOH, using 32 S&W (short) brass, they fire formed as well to the 32-20 chamber but being short, they only had a flare to the case mouth,,no mid case bulge.
Those shorty case would load and reload 6 to 8 times before cracking at the mouth. Probably could have been more thrifty and annealed them after a few firing and they would have lasted longer.
But they did well.
Not bad on the accuracy either. Just kind of wimpy in the heavy Bisley Model.
I must admit the 32-20 was never a favorite of mine in the SAA's
I'd rather a 38spcl at least (Colt Special of course!). But the 32-20 is a favorite of many.