The grip should be oval in cross section. However, from the photo, it appears to be rectangular with rounded corners. It could be that the photo doesn't 'see' the form right, as often happens in photos.
The wood could be lower on the barrel flats, as mentioned before, but you have to re-do you nosecap. It depends how much you want to re-do on this gun, or do it differently on the next. Leaving the wood here it is won't kill the gun, by any means.
Nice clean, well thought out workmanship, John. You're doing a great job. I can see you are a real craftsman, and are taking to the longrifle very well.
Tom