The shoulder is adequate for a 375-08, but I would prefer more. (that's just me though) One could reduce body taper and increase shoulder angle, providing a more "positive" headspace situation. But, this could lead to feeding problems. They can be dealt with also. I haven't run the numbers, but suspect the velocity decrease will be such, that bullet selection might be a little more critical. I would think with the lighter bullets, it would still be an effective round on deer and black bear round out to a 100yds, maybe farther. I don't know how it would work with bullets over 225 grs. . Most of those bullets were designed with more velocity in mind, except the flat nosed ones. By rights, (piston effect) one could expect like velocities in a 375-308/358, as with same bullet weight in the 358 win.. But the case is relatively small and very efficient. The returns of the piston effect in going to a larger caliber in efficient cases are diminished somewhat, but should close enough to give you a idea of what you might be looking velocity wise. If the 375-08 serves your needs or wants, there is certainly nothing wrong with that choice. :wink:
Dave
