There may be some confusion regarding Nice shot as originally manufactured, and loaded by RST in its non-toxic shotshells. I don't know if it's currently being made to the same specs, or being manufactured at all. Nice was made of 58% tungsten, 38% tin and 4% iron, and it has a density of 11.0 grams/cubic centimeter. Pure lead is 11.1 gms/cc, and high antimony hard-lead shot is a little less dense than that. Thus, Nice shot is quite soft (owing to its high tin content) and will perform just about like lead shot will.
I've never used ITX shot which is said to be made of tungsten and iron but I don't have the exact percentages. Its density is supposed to 10.0 gms/cc, hence it will lose velocity more quickly than Nice or lead (for a given diameter of shot pellet). Also for comparison - Bismuth shot is 9.6 gms/cc and steel is generally shown as about 7.9 gms/cc. Kent Tungsten Matrix which is favored in factory loads by many vintage waterfowl hunters is listed at 10.6 gms/cc. I don't have data on any other type non-tox shot. Sorry.
Net, of the products shown here I believe that Nice shot is your best choice for extended range waterfowl shooting, followed closely by Kent TM ..... when both are started at the same high muzzle velocity. Just my opinion gents!
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