Ok, if Dan says it isn't a Howe stock, you should believe him.
To my knowledge, on bolt action rifles, Howe tended to use horn forend tips and grip caps. His cheekpieces were dished, though that is hard to see in photos sometimes.
I have one Howe rifle, it is discussed here
My HoweHere is a thread that discussed all the little strange things, that Howe did, that help to identify his work.
Howe stock embellishmentsIn the latter thread, LRF makes a point
"... the express sights on the Springfield above are very nice and prove his metal working skills. As to stock design and execution of making and finishing the stock, not so much"
so maybe not being done by Howe isn't such a bad thing.
I like the stock on the rifle that you posted, thanks for creating this thread, it is always nice to look at a fine rifle.