H 4895 is slightly faster than IMR 4895 with Reloader 12 between the two. Unless you are operating at near max loads there is nothiing to worry about when exchanging data. If working up towards the max load, you can always substitute the slower powder for faster powder data. In other words, if you have a Hodgdon book and IMR powder, you can safely load the IMR 4895 to the figures listed for H 4895.