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I went out to the range this morning with my father and little brother, while we were out there we met a friend of my father's from work who was testing out a gun he had modified. It was a Kimber Pro Carry II (Aluminum frame) that he had bored out and modified to use 10MM ammo. He said that this was his second trip out with it, the first time out the grips cracked halfway through the second magazine. Does anyone else think this gun would be painful to shoot, or at least hard to control?

I gotta ask... if you want a 10mm 1911 - why not just get a 10mm 1911? Kimber even makes some!

No, I don't think a real 10mm 1911 would be that bad. The ergos of the 1911 are great and 10mm isn't too hot. I would love to have one. With that said - NO WAY would I shoot THAT 1911.

I'd shoot it, and enjoy every BOOM. A lot of folks buy 40SW chambered 1911's and have the chamber reamed to 10mm or just get a second barrel in 10mm. Get some 10mm mags and a heavy recoil spring and shoot it.
In an alloy framed gun I'd be more concerned about the life of the gun than the increase in felt recoil. My LW Kimber Pro Carry in 45acp is a handful with +P ammo so I can imagine what a full house 10mm load would feel like. How does a 180gr Gold Dot at 1300fps sound? Sounds good I say.

If the grips were screwed on rather tightly, and the frame flexed significantly, it could theoretically snap the grips.

My MAJOR concern would be the frame fatiguing and cracking or Ka-BOOM-ing from the 10mm. That round has worn out many steel frames; Kimber's aluminum frames will wear excessively with .45 +P, to say nothing of .45 Super or 10mm. They're simply not rated for it.

I wouldn't worry so much about recoil as I would worry about your buddy destroying his gun.

Yip....with an AL frame, tight screws, and some moderate loads, I can easily see a set of grips snapping. Not that big of a deal.