I think that they came chambered for several cartridges - .219, .25-35, .30-30, and probably .32WS. I just assumed his was a .30-30 since those were the most common. He didn't say what cartridge it was chambered for.
Whatever it is, it's a purty one!
I have leverguns with both straight and pistol grips, but definitely prefer a pistol grip stock. Carbines are mighty handy, but I usually prefer to have the rifle-length barrel. That's why I'd rather have a M-64 instead of a M-94 carbine.