Champlain
I might suggest clicking on the "search the forum" button above, type in "Nitro" as the search term and limit the search to just the turkey hunting forum.
or
Back a page or two in this forum there is athread about hevishot. I posted a pic of one of my Nitro targets and also provided a lengthy explanation of the differences between hevishot loads including those manufactured by the Nitro Ammunition Company in Mountain Grove Missouri.
Disclaimer: I am not an employee of the Nitro company nor do I stand to benefit in any way from the sale of Nitro ammo. I am simply a turkey hunter seeking the best possible combination of load, choke, and gun to cleanly and efficiently harvest gobblers at all reasonable rages. In Nitro ammunition I have found the holy grail.
Pic of my nitro target at 40 yards
http://www.hunting.net/forum/tm.aspx?m=2725325
Explaination of "heavier than lead" ammo
http://www.hunting.net/forum/tm.aspx?m=2725325&mpage=4&key=
Link to the Nitro Company website
http://www.nitrocompany.com