I had an issue with my Bisley Single Six .32 Mag perforating small pistol primers when fired, even with very soft loads. (I think the firing pin is a tad too long.) So, I swapped to reloading with small rifle primers for my .32 loads. Since the swap to SRP I have had no further issues and the loads shoot well.
## The following have shown to be safe in my gun, please reduce and work up a safe load in yours!##
My absolute maximum .32 H&R load is a Montana Bullet Works 125 gr SWCGC over 4.2 gr Unique. It is a lower charge than some that others have done, but I don’t ride too far along the razors’ edge. Accuracy is good but not great.
A Brazos Bullets 100 gr Coated RNFP over 4.2 gr Unique is a really good load; pretty fast and accurate in my gun.
Both the 115 Missouri Bullet Co Costed RNFP over 3.9 gr Unique and an ACME coated 120 gr RNFP over 3.7 gr Unique are also fun loads, the 120 gr load is my best one for accuracy.
#1 was a wadcutter load, #2 was the 125 gr load, #3 was the 100 gr load and #4 at low right was the 120 gr load. 18 shots @ 15 yards, butt rested on the table. (Lower left were a couple of shots I fired with some leftovers.) Not bullseye quality stuff on my part, but these should be spot on at 30-35 yards which is perfect bunny-distance.
Stay safe.