I agree with Clyde that you should get one bag mould for your favorite re-enacting rifle/smoothbore and use modern for casting at home.
The small handles on a bag mould are uncomfortable and get hot fast. They work for small batches just fine.
Larry Callahan makes very good bag moulds. He has standard sizes for calibers from .32 thru .62 and can make any custom sizes you need for a little more. I have one for my .54 and am very happy with it.
http://bagmolds.com/[/quote]
Gentleman, thank you all for the great replies! Specific question here, I actually called Larry yesterday and he returned my call but I was tied up and unable to answer. My question was regarding a few mold sizes. Right now I'm planning on the purchase of a .54 caliber mold then a .600 at a later time. He offers .530 and .535 (which I shoot both) then an actual mold listed .54 cal. My question was if the .54 cal mold was an in between size of sorts. I find I'm able to squeeze a little more from a .535 ball, but sometimes it can obviously become a bear to load.