Go to the castboolits site and search "collar button". Lightweight .45 cal bullet that looks kinda odd but amounts to about as little weight as you can fit into the cartridge and still reach the sides with both ends of the bullet.
Why the "please remove"? This isn't the EE, it does not cost to leave the info up, an the info that you removed may well have helped someone else. Kinda lamer move.
Cheers
Trev