That's a nice rifle. I agree with the above post - the distance from the top of the wrist to the grip rail may be a bit of illusion in this case due to the undercut "step" in the underside of the wrist.
On the other hand if you look at most (not all, but most) original American southern rifles with stepped wrists, there is usually a slight radius to the grip rail, to bring it up a bit closer the underside of the wrist, and makes it a bit easier to grip. Visually, I think it looks better too. I find straight grip rails that stand out really far from the wrist a little uncomfortable - bit more radius reduces how much I have to stretch to reach the triggers, and keeps my hand locked in place when shooting. Just my preference. For a large person, I can see where the extra distance on the rail would feel better to them.
Guy