I just attribute it to the rear locking bolt. I don't think the action is particulary springy. Rear locking bolts tend to be harder on brass in comparison to something like a mauser action. With the 99, "it is what it is."
"The universal aptitude for ineptitude makes any human accomplishment an incredible miracle." John Stapp - "Stapp's Law" "Klaatu barada nikto"
