I just purchased a Kimber Super Carry Pro HD in .45Cal. Ihave not been able to shoot it yet so on Friday I am planning on putting 500 round through it. From what I have read and have been told by other Kimberowners the normal break in period is about 500 rounds. They also recommendedthat this break in be done in one range visit because the hotter the gun getsthe better it will function after the 500 rounds. I was also told to purchase Springfield Armary Magazines for the Kimber they are said to work the best in the gun even better than the Kimber Magazines.