If you are a reloader, you have a couple of options: Bismuth
https://www.precisionreloading.com/cart.php#!c=134
...or NICE shot
https://www.precisionreloading.com/cart.php#!c=136
Both are pricey, yes.....but if you are only shooting a few shells a year through a special firearm, it should last you a while.
You can also get loaded shotshells from Able Ammo:
http://www.ableammo.com/catalog/gau...nt-prices-c-10480_14626_11576_16378.htmlGood luck..........