I shoot a Greener 10 bore G-gun that dislikes plastic shotcups,or heavy mylar wraps,but patterns great with card wads.Dave at BPI pressure tested some 2 7/8" loads for me with teflon wraps,(the stuff is abrasive)on calling me with the results he seemed a bit worried that the ends of the Federal cases were all ripped off!Apparently those little belts on the shot grab the case walls,and bring it with!
I got it to shoot(without destroying my cases),by using a double wrap of slick paper .005 thick,and backing off the powder a bit.
The other problem density,itx is about 25% lighter than lead.There are more #2 in an 1 1/4 oz. load than 1 1/2 oz. of bismuth,takes up to much room in the case and does not maintain enough energy at the ranges we shoot snows at.I loaded my right barrel with itx and the left with bismuth,same size shot(#2) and same choke(very full).The result--one snow with the itx,a head shot,and about six with bismuth,I switched to all bismuth for the remainder.
I would like to add I have nothing against BPI,I am glad they supply us with the stuff we need,I just don't care for their shot!Your results may vary.