I shoot Hornady 410s with a MMP SUB-BASE, I also shoot a 370 Grain Maxi with
a card wad under the bullet!

Note: I did make a cutter and open up the Diameters of my Maxi mold. top to
bottom-.512-.506-.500.

My groups went from 3-4" at 100yds down to 1 1/2 and smaller just by using
the sub-base, or a card wad under the bullets. My loads are Goex, 90FF to
115FF, out of my .50 cal. Underhammer with a 1 in 30 twist DeHaas Barrel.


Some of the WAD links that I have found

http://www.buffaloarms.com/browse.cfm/browse.cfm/4,4964.html
http://www.sagebrushproducts.com/ShootingProducts....
http://www.circlefly.com/
http://www.trackofthewolf.com/categories/tableList...
http://www.castbullet.com/wads.htm

Some of the more expensive " Veggie" wads are made from:

Vegetable fiber gasket material engineered to resist high heat & compression
and water resistant.

Or you can make your own with some heavy card stock and a Gasget [Arch]
punch.