O.K., all you lovers of the old 10 bores. Here's my world famous all purpose load that Last Dollar keeps raving about. Y'all gotta promise not to let this secret recipe become public though. This is one whomper/stomper load fer big feathered creatures!
1 1/4 oz leadFederal plastic hull cut to 2 7/8"
Winchester 209 primer
35 grains IMR 4756
Remington SP 10 plastic wad (1 16 ga .125 wad inside shot cup)
Six fold crimp
Reported as 5,800 psi and 1194 fps.
Note: 1 1/4 oz bismuth fills SP10 nicely without the wad filler.
Hulls and wads from Ballistic Products
______________________________________________________________
If that ain't enough firepower fer you then stuff this down the bore:
1 1/2 oz shotFederal plastic hull
Winchester 209 primer
34 grains IMR 4756
Ballistic Product X10X plastic over powder wad and 3/8" fiber filler wad
Mylar shot collar
6 point crimp*
Reported to be 7,000 psi and 1,167 fps.
*Note: An overshot card made a prettier crimp. If using bismuth I just use the same volume shot as with lead. It will weigh less but has the same number of shot. The duck won't know the difference. I quit using buffer in the bismuth cause it's too much trouble--to heck with it.
Disclaimer: I have no idea if the pressures and velocities listed for either of these loads are correct. They're what I've read somewhere and personally use. I have shot a lot of both and my damascus barreled guns haven't blown up (yet). 
________________________________________________________________________
Here's some birdies that took the 1 1/4 oz of Bismuth. Gun is a Parker DH #3 frame 10 bore
