"I was wondering if any of you know what level of recoil this thing could take before wearing out, IE shooting loose."

No one can answer that question, for your gun. The hang tag attached to the gun when new, possibly 100 years ago, likely called for a 1 1/8 oz. 3 Dr. Eq. load. No one knows what boomers have been used since. The head of the stock may crack prior to the gun shooting loose, or maybe not.

For reference:
1 1/8 oz. at 1150 fps in a 7.5 pound shotgun = 20 ft/lbs of free recoil
1 1/8 oz. at 1200 (3 Dram) in a 7.5 pound shotgun = 23.0 ft/lbs
1 1/4 oz. 3 1/4 Dr. Eq. (1220 fps) in an 8 pound gun = 25 ft/lbs

https://sites.google.com/a/damascusknowledge.com/www/home