There is a link to heavy buffers sold at Brownells on the site. Here it is.
http://www.avantlink.com/click.php?tt=ale&ti=4623&pri=0&pw=18199&mi=10077&ctc=IPB4308AR&url=http%3A%2F%2Fwww.brownells.com%2Fmanufacturers%2FHEAVY%20BUFFERS%2Findex.htm
I hate having ammo when I don't have a gun to shoot it in. That's why I will some day own a 10mm. Then I can try some of @MikedaddyH's "warm" loads. lol