Fiocchi makes similar ammo for the Nagants, but the Serbian-made 'prvi partizan' ammo described as '7,62 mm Nagant FPJ' with a bullet of 98 gr ('6,35 gm'), is less expensive and available. It is the same OAL cartridge as the Fiocchi and the Russian Target ammo, seemingly, no longer available - crimped at the front - ahead of the nearly flush mounted plated wadcutter. The cartridge extends over the inverse b/c gap, effectively sealing the gap from pressure loss, while expanding the thin cartridge mouth. The result is that, as the trigger is released, the cylinder goes back to rest, pulling the expanded case mouth from the barrel entrance.
Shorter cased ammo - like the modified .32-20 cases and .32 S&WL - don't bridge the gap. The modified .32-20 cases fall out - the bulged .32 S&WL cases need the SA-style ejector rod to punch them free. BTW, better than the steel 7.62 Nagant Lee die, which needs lube, is the Lee carbide M1 Carbine die - no lube! I further modify my mixed .32-20 brass by turning .024" off the rim's OD in a Taig micro-lathe - and sand away .010" of rim thickness with 1,000 grit SiC W/D paper. The latter can be ommitted - if you find a spare breech block and remove .010" from it. Save the OEM parts - shooting factory ammo is more fun.
When you manage to pull the Nagant trigger in DA, the cylinder rotates 1/7 th of a revolution, bringing up the next of seven chambers and pushes the cylinder against a returning spring so that th b/c gap closes (The barrel entrance is convex; the cylinder exits are concave.) and brings up a breech block on the back of the cylinder, so the cartridge will stay put during ignition and cocks the hammer's wishbone leaf spring then the hammer, with it's long snout of a firing pin, drops and the cartidge fires. The whole action is held together by one screw - which can trap that hammer spring so the trigger assembly can be removed. The parts are serialized and hand-fitted - and generally, not interchangeable. Additionally, I have never found an aftermarket .32 ACP which would fit any of my Nagants. Besides, .32 ACP ammo isn't cheap - and it is more anemic! The Serbian ammo is appropriate - and my current choice. My homebrews, with Meister 100gr .312" LDEWC, are too much trouble to make.
Stainz