When H4350 was first introduced, it was pretty consistently a little slower than IMR4350. And that's the way my present jug of H4350 is.
Recently, however, I've noticed on the Hodgdon website that H4350 loads are often a little lighter than IMR4350 loads, implying H4350 is a little faster. This might be due to the latest manufacturing lot of H4350, but I don't know.
