If you have shot that gun enough to know what to expect, I can't see any reason why it should take more than 10 or 15 shots, at most, to verify that it's OK. Frankly, 3-5 aught to tell you. I can't imagine what's going to break 50 shots later that wouldn't already be broken, or break in 4 or 5.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.