Hi, sure are. I used it last year in a couple of my Improved mod. chokes and not one problem. No rings, bludging, nothing. It also hammered the roosters at long range (when I did my part).
Before I bought some I spoke with Brain about it and he also states that it's safe for all chokes.
The loads that Brain makes are good ones, cheaper than anyother non-tox I can find and well made. I have no complaints at all and highly recommend New Era. In fact they are the only low pressure loads that I use now. I prefer them to RST and B&P, just my opinion however.
You can google ITX and get a lot more info, for example:
http://www.ballisticproducts.com/ITX-Shot-2-150-bag_7-lbs/productinfo/TX02/Anyway, best of luck to you!
Greg