I dislocated a finger firing on a turkey at an extremely odd angle after he busted me...I shot the turkey at 5 yards or less...not even kidding when I say he almost stepped on me..My buddy in college bought the 3.5” 12 gauge turkey special with the green/gray camo. He was pretty inexperienced shotgun wise (he borrowed a spare gun from me for his first bird) and he took the weight out of the stock. I begged him not to shoot the 3.5 magnums. Broke his collarbone on the 3rd shot. He still managed to kill one with lighter loads shooting left handed that year with sheer determination and flat out craziness.
JFC... that had to be brutal....the buttstock and ccounterweight help considerably.... the ATI conversion was rumored to collapse under recoil of the heavier loads...Had a customer bring in one of the H&r 10ga guns, wanted it cut to 18", and fitted for a collapsible AR style stock.
So, I cut it (just over 18"), and made a custom adapter block out of aluminum that attached via the stock bolt hole, and took any AR style extension tube. He put this spring loaded recoil reduction thing in, and an m4 stock went on that.