It's a great cartridge, but a little finicky (in my opinion). You can purchase ready formed brass from Midway, but it's a little on the expensive side. Making the brass from 30-30's is a little time consuming, so making brass is not for folks who have no patience.
There are only a few "spire-points" that will work well in the 357 Herret as a pistol, one of the best is the Hornandy 180 grain SSP/SP (Single Shot Pistol/Spire Point). In a carbine, any bullets that will work in the 35 Remington will work, the extra velocity will allow the bullet to expand.
The problem I found is that my 10" barrel will not fling some bullets fast enough to expand. I lost a big doe this year because of this (live and learn). However, any of the bullets that are for the 357 mag and 357Max will work well, but I don't know how far. For the extra distance, you'll need to get the SSP/SP's for pistol length barrels.
The 357 Herret lost some of it's following when TC started chambering the Contender in 35 Remington. In fact, you might consider the 357 Herret to be a 35 Remington with a rim.
I'm certainly not knocking the cartridge. My 10" barrel is very accurate,capable of 1" groups at 100 yards, but it's not one of my favorites in a pistol length barrel. Might be great, and worth the trouble in a carbine length barrel, but you could alsways get a 35 Remington.