Sorry I do not have pictures, but - I used to have a nice walnut thumbhole stocked .308 match rifle on a VZ Mauser action I used for prone and 3-position shooting. It was a wonderful piece, and the recoil I thought quite soft and easy shooting.

Then, 20 years later, in the 90's, I did a bedding job for a friend on his "custom made" .338 Win. Mag. thumbhole glass stocked rifle - even at 9 pounds, what killer recoil it had. Nasty & damaging (shoulder and face), every shot.

I sent it back to him with his ammo, properly bedded with instructions that he'd have to sight it in himself - I just couldn't shoot it accurately, it hurt too much.

good luck was upon him and that fall his horse rolled over on it (in scabbard) and broke the fiberglass stock at the wrist. I re-stocked it for him in a Boyd-Boys standard (J. Sundra) laminate stock, same overall weight of 9 pounds and what a nice shooting rifle it was when finished! Easy to shoot and no obtuse recoil at all, just as .338WM's should be.

Seems to me, that thumbhole stocks with their normal straight line combs are not magnum friendly - at all - at least, not for me.