Hi, a group buy for a 400 grain LFN style gas check 6 cavity bullet mold is starting up.
Details here:
http://castboolits.gunloads.com/showthread.php?t=17938
It's intended for 480 Ruger and 475 Linebaugh with 2 crimp grooves to fit the Freedom Arms guns and the others with a longer cylinder.
It may do well in other calibers such as 470 Capstick, 470NE...
Price is generally somewhere around $60ish delivered to the US. Foreign destinations are more for postage.

I'm not running the buy, all the details should be on the Cast Boolit site.

customcastbullets.com has the 500gr bullets its a woodliegh copy

For not much more you can get mountain mold to make up exactly what you want. I have a mm 400 gr LFNgc with a long .51" nose for max powder capacity in the 480.

It's the bullet 2nd from the right, next to the 460gr WFNgc.