I haven't done any shotgun shell loading in over 30 years so I am basically new to reloading. I have 3-8oz. cans of Hercules Green Dot. I'm wondering if current Green Dot recipes will be ok for this powder? I also have 3 charge bars for an old Mec 600jr. that I don't know what size they are. All 20 ga. , one is marked 2, one is marked 2A, and the last marked 4. Any imfo will be much appreciated.