I have been buying H4895 to fill in when IMR4895 was not available. Have used it in .223 and .30-06 loads and it works just fine. The curious thing is that Hodgdon makes both H4895 and IMR4895, but more H4895 is around for sale. The link below shows that suggested loads are within a few grains of each other for a specific caliber and bullet using either powder. I prefer IMR4895. Take care...
Joe
http://data.hodgdon.com/main_menu.asp