I have shot enough of the Lee .452-255 RFN, which fall out at 260grs with my alloy, to know they shoot very well and accurately from my 1911. I don't make it a regular habit of doing so, but I also didn't notice any issues once I stripped it down for a good cleaning.
I have also shot the MP .452-630 as well using both the large and small pin HP's and they also shot very well. Using between 4 and 5 grains of Unique they make a fine shooting round. Again I don't make it a regular practice but I do have one clip full of the MP's which goes with me everywhere the 1911 goes.
This is a little test I did when I first gave them a try,
Cast - VS - Jacketed
While not totally conclusive, and being that the alloy I used is a bit hard for the velocity they are running, the newer ones with the softer alloy really do open up nicely and I would think they would do a good job on or against anything I were to put them to task on.