Stock breakage

[Woodcock survey]

After reading many threads about appropriate ammo for vintage guns i have asked myself if in 10 years as a member and 5 as an associate if i have ever seen a first hand example of stock damage directly attributable to these so called magnum loads and can't say that i have.
Do not get me wrong, i am an advocate of light loads. Have promoted 3/4 and 7/8 12 ga. loads in many threads here. At the clubs i shoot at i am known as a PIA about it.
Does anyone have first hand experience with a load that damaged wood that can be directly linked to heavy loads? The stock makers on here probably have the most to do with this and would see it in repairs and replacement work.
Again i do not believe there is any need for the heavy fast loads ammo companies promote.