I don't have any experience with the Ruger 1911, but with mine I break em in with around 400 rounds of any good brand 230grn FMJ. Then start seeing which defense ammo will run through it.
The 400 break in rounds don't have to be in one range trip, obviously. And that's just the number I go for.
"The Constitution shall never be construed to prevent the people of the United States who are peaceable citizens from keeping their own arms."
- Samuel Adams