I am ready to get flamed for writing this.
I don't think it's a good practice (using dry ice to make hash) but I'm often wrong and can be convinced otherwise. I would stick to the 73, or a 90 at most for a bubble bag. I've made it this way few years ago and the issues I have with it: it's brutal, the dry ice shatters the trichomes; if you use a bag higher than 90 the output is too coarse, too much plant matter with the trichomes. I think the best way to make hash is either to use dry sift filter screens (relatively easy), or bubble hash (what a pain that is to make imo). I would not use flower that is uncured with dry ice. It should be cured, not just dried. If it's not cured there's going to be more chlorophyll in the dry ice hash than I can take. Tastes like a swamp and is very very harsh. The less cured it is the greener your hash output will be.
However some people may have success and like it which is great, just opinions. People sure bought it when it was available.