Couple of seasons ago I used the Nice Shot #2 on some honkers with good luck. I have also used the bismuth #2 in the short 10. Since ITX is much cheaper and I have a bunch of 2 7/8" 10ga loaded with bismuth #2 I only loaded the ITX in #4 mainly for ducks. I figured it is about 85% the density of lead shot and a 1 1/4oz load of lead #4 has about the same number of pellets as 1oz of ITX. Therefore, it takes up a lot of room in the case. I was able to use the same low pressure 12 bore 1oz load as I use for clays (with a substition for a wad with more room). It is certainly better than steel shot but the load I was using was pretty much a decoying load. I don't usually take shots over 35-40 yards on ducks anyway. I did use a few of these loads for snow geese over decoys and I was as successful as the guys using steel shot loads. I was shooting much tighter chokes than they were. A tight choked VH 32" Parker. If you hit them they drop...
I have also used the #4 ITX on some honkers out of a 12bore with good luck over decoys and some shots approaching 50 yards. I occassionaly have geese come in while duck hunting and the #4 seemed to work just fine. Dead is dead.
For 12 bore I would shoot factory bismuth and TM if the gun and bores are stout. I have done so with an early parker #2 frame GH with no issues. For the short 10 you can order factory loaded nice shot from RST.
Gunnerman books has a 10ga short 10 loading manual that uses IMR 7625 exclusively. It is a great powder until it gets down into the single digits. One of the parker guys uses it in Alaska into the negative temps on clays. I usually load my hunting loads with smokeless because, after a long day of hunting all I want to do is eat a hearty meal, have a few drinks and socialize...not clean the bores of a shotgun.
Sorry, I just remembered you were asking about black powder. 4 drams seems like a lot of powder. Cripe, when I shoot 12ga 2 1/2 drams under 1oz of shot at sporting clays I am sore for two weeks. It has been awhile since I shot black powder 10's. I do not currently have a BP hammer gun in working order. But, if memory serves me that BP kicks a lot more than my low pressure smokeless. Well, I just pulled out an old table and you need a little more powder for the short 10 BP loads, Light: 4drams to 1oz shot, Normal: 4 drams to 1.25oz shot and heavy: 4 1/2drams to 1.5oz of shot. I was thinking some guys ran 5 drams for some really heavy loads. here is the link:
http://www.tbullock.com/bpsg.htmlSome of the old books talked about what loads they were using for specific critters. Seems like there was a lot of good information in one of Leffingwells books.
Reloaders Specialties is supposed to have a soft non toxic shot out for this fall. L.P. Brezny wrote an article in the last wildfowl rag. I went to the website but they had no information yet. I did not call to ask any questions. It may be a winner.
For that heavy load of 4.5 drams BP and 1.5 oz shot I would want a pretty heavy gun for that load. It may be just the load for an 11.8 lb parker lifter 10ga I have been working on...!!
Good luck and shoot straight,
Kurt
P.S. See ya this weekend Market Hunter