Spend considerable time on that site, play with the numbers and features.

I've seen bullets thrown from moulds commissioned through that site (I can see the algorithm of his program all over the 'boolit' community), and via no fault of the business, most of them aren't what I'd want to stuff down the bores of anything I own.

He has limits in his design software to account for the shape of his tooling. Although perfectly functional bullet moulds can be designed there, you might have to screw with the parameters a bit to get just what you want.

Have fun with it!

Cheers
Tinker