All of the ITX shot products that I have seen are of the same softness and can definately be crushed easily with regular sized hand pliers. I use #4 ITX shot mostly, but I am getting some #6 ITX to try.
I asked the engineer why the larger roundball cannot be crushed like the shot (it seems WAY harder) He said that it actually is the same material, same recipe---it is just proportionally bigger, therefore if you had a giant set of pliers you could crush it too.
I have found in my testing that the .487 ITX roundball loads smoothly with zero patch cutting (greased pillow tick patch or thicker) and it hits the target about the same group as when I use lead. I am reasonably careful to load it so that the narrow band is parallel with the bore, and so far I have had zero problems. Like I said above, while out hunting deer, I have killed a squirrel with it. And I have shot it at 25, 50 and 80 yards. I have also performed penetration tests and found that it penetrates deeper than lead--- 3" for lead, to 5" for ITX in my tests--all other things being equal.
Its not lead, that is for sure! Its harder. I like lead better and always will, for traditional muzzleloading. Lead is what these old guns are designed to shoot...
BUT... if my only choice is to leave my muzzleloader at home sitting on the rack, or use ITX and be able to hunt with my ML? I will choose to use whatever I can that will work safely to achieve that. And ITX does work, and so far as I can tell, it has been 100% safe for my rifle and smoothbore.
I cannot guarantee the same results for anyone else. I totally understand the concern... If I were a competition target shooter, I would be very careful what I put down my prized rifle. But I am just a plinker and a hunter of average skill... My guns are nice but only average too... I love em! and I would not pour rock down the barrels...
(Note: I have used ITX in a Rice rifled barrel, a borrowed rifle with a Colerain barrel, and my Longhammock smoothbore... None of these exhibit any abuse or abnormal wear. I actually consulted with Rice before trying ITX in their barrels and Jason felt that it would not pose any problem)
I do not think ITX is the "magic bean," but I think it is something that does work in ML hunting applications where lead is not allowed. I am going to be using ITX shot & roundball this year exclusively, so I will check in when I learn more.
Ken