I haven't shot mine in a while, but when I bought mine the seller included 100 rounds of 300gr ammunition that is haven't finished yet.
I think it's a ton of fun to chunk bullets the size of ashtrays at pretty slow speeds, but I wouldn't want to try pushing big bullets really fast out of anything, even that beast.
That gun weighs a whole bunch. Even the little ones aren't exactly light. They're manageable if you're not scared of them.
The costs to reload can vary widely depending on bullet choice. As low as about 75 cents per round I would guess. They don't require a huge powder load if you're not trying to push them stupid fast.
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