I only use IMR 4895 for 223. The issue of interchanging H4895 and IMR4895 is a point of debate with me. You have to remember that when Hodgdon started up they where packaging and selling surplus government powder. There h4895 was nothing more than surplus IMR 4895. I treat them the same. And some burning rate charts do also. But I also rework up my loads when ever I change powder lots. That isn't terrible often since when I get a load figured out I then purchase an 8 lb can and go back throught the process and verify the load with the new lot of powder. I believe if I remember correctly there is only supposed to be a 3% difference between lots of canister grade powder. And now that hodgdon owns IMR I expect there will be even less differences.