45man, you might try a fired 45acp case this would allow an extra large projectile in the mix, I?ve read where folks have fired them in 475?s. I?ve always had good luck with leather and a drop of Elmer?s......I make shot for my 500?s.
Trapr
NRA Endowment mbr. USPSA/IPSC U.S. Practical rifle/shotgun national team