It looks like Hodgdon's recc's for H4895 are on the high side at least relative to Sierra's data. This requires a little bit of extrapolation but follow me:
Hodgdon lists a range of 43gr to 46gr for H4895 and 155gr bullets. They also list IMR 4895 at 43.5gr to 47.5gr compressed. I know these powders are not interchangeable, but they're in the same ballpark. I'm including the IMR 4895 because...
Sierra's manual doesn't list H4895 for 155gr bullets. They do however list IMR 4895, with a range of 39.8gr to 43.7gr. If one goes by the trends in the Hodgdon data, Sierra's H4895 numbers would probably be at least similar to their IMR 4895 numbers. That would put 43gr in the neighborhood of a max load according to Sierra.
If you really want to use H4895 I would suggest starting with a 38-39gr charge and working up to your desired velocity while paying attention to pressure signs. I know that usually powder manufacturers recommend that you not go below their minimum loads, but H4895 is somewhat special in this regard. Hodgdon themselves recommends it for reduced power rifle loads and says you can take the max charge out of their data and multiply it by 0.6 to get a reduced weight starting charge. I don't have a high enough post count to post links, but google "h4895 reduced rifle loads" and a PDF from Hodgdon is the top hit.
Chuck Hawks has an article discussing this as well. Google "h4895 versatile" and it's the top hit.
EDIT: FYI, the Sierra manual shows 2500fps for the starting IMR 4895 charge and 2800fps for the max. That's out of a 26" barrel. OAL for the 155gr is 2.775".