The federal hulls will eventually show up on the marketplace , eventually ...... When nitro gets them , I suggest you buy several boxes of it and stash it away , it's not a cheap option but most 10 gauge shooters are ammo hoarders by nature and understand the availability problems of owning a ever increasingly uncommon firearm
In the meanwhile I suggest if you like the h210 nitro , start calling up all the dealers they have and see if you can get yourself stocked up , if you can't find any I also highly recommend the federal #7 hw it's a awesome shell , perhaps the best factory 10 gauge turkey shell ever produced - do the same and buy plenty of it, because chances are likely that it will become scarce very soon , like the 20 gauge #7's did last season