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1000 rounds to break in a gun means you bought the wrong gun.
I will generally run 200 to 500 through most guns. Maybe 500 to 750 for a 1911. If the type of gun is new to me, its more breaking me in vs the gun. If Someone carried nothing but a Glock or M&P for a while and then went to a SIG DA/SA gun, they should take some time and do some drills to make friends.