Fiocchi makes the only loaded shells available in the US. They come 2 1/2", 11/16 oz of 5,6 or 8. They use traditional nitro cards and felt or plastic brush wads. 24s are roll crimped. The lead is soft and you have to scrub your barrels. Recoil is very mild. It seems to be tuned down for older garden guns. The factory load is only 11/16. It makes the gun shoot like a low performance 3" .410.
Traditionally the load is 13/16 oz. With a modern wad you can load up to 13/16. This puts the gun into 20 gauge territory. 13/16 of #8 1/2 is virtually the same pellet count as a 12 gauge with 1 1/8 of #7 ½. At typical sporting clays/skeet shots, a 24 ga with 13/16 of 8 1/2s shoots right up there with the 12s.
Ballistic Products has all the supplies. They have a modern a Gullardi (Italian) wad that is great. It has wad petals and leaves the bores much cleaner than the factory loads. The wad also has a gas ring around the base of the wad that gives good sealing to stop powder migration.
There are 3 hulls to choose from; Fiocchi, Cheddite and solid brass (Magtech). Expect only 2-3 reloads from Fiocchi hulls. I have a friend who loads the Cheddite and likes them a little better than the Fiocchis. I use the factory ammo for Skeet just to get the hulls emptied.
My smokeless loads were created by extrapolating between a 20 gauge 7/8 oz and 28 gauge 3/4 loads to decide how much powder to use. I use Dupont PB because it operates at very gentle pressures over a wide range of loads in many gauges. It is a denser powder that performs well in small cases.
My standard load is Dupont PB.

14.7 grs PB (mec 23 bushing), CCI 209 primer, Gullardi wad, 13/16 shot, card over.

I converted a 28 gauge MEC 600jr reloader to handle 24 ga. I used a Dremel moto-tool to open up the 28 ga sizing ring to resize the 24. Open up a 3/4 oz shot bar with the Dremel to 13/16 oz. Those 2 steps take awhile as you grind a little, check the results and grind some more. The primer station is fine. Get a 20 gauge wad guide. I broke some of the petals out of the wad guide so it would go down into the smaller hull. Remove the last 2 stations since you’ll be roll crimping.
You will need a 20 gauge roll crimper. It will handle the 24 just fine. My reloads had a slight “mushroom” top. They still went in the chamber OK. Ballistic Products has card-over wads for closure. I am still in the hunt for a real Lyman 24 gauge roll crimper.

I have fired thousands of rounds of 24 through 2 different 24s using this setup.

They have worked for me. I won 2 24 gauge Vintage Cup championships with 2 different guns using this loads.

My disclaimer: I make no claim as to the safety of these loads or the suitability in your guns.


Good luck,
Joe