Took my SIS ultra out the other day with some Freedom Munitions remanufactured .45 ammo. Malfunction city: every 2 or 3 rds the brass would eject but not pick up a fresh round from the mag. I tried a couple of different mags, and that did not remedy the problem.
Oh Wow!! Has anyone else had problems with Freedom Munitions 45 ammo? I was thinking about ordering some of it. Was that the RN 230 grain that was giving you trouble? Do you have a polished feed ramp? Were all your clips made by the same company?
I have shot well over 10,000 rounds of Freedom Munitions reloads and have another 3,000 sitting in my ammo locker. I've done this over the past couple of years using 4 Kimbers and never had a problem like that. 80% of my 30 magazines (yes I recently bought more) are KimPro Tac-Mags.
Sounds to me like you have eliminated the magazine from the equation. That leaves two possible issues. Either your pistol needs a serious cleaning or you have a weak recoil spring. If your pistol is clean, well, you pretty much have your answer. Replace the recoil spring or give the miracle workers at Kimber Customer Service a call. These guys have achieved near legendary status for their skill at getting problem pistols to perform up to customer expectations!!
You can follow my advice and hope that I am right about the spring or put your trust in the Kimber Wizards. BTW, the Wizards work cheap!!!