Just shoot the .452" version then. If you're concerned about the extra .001" (no big deal in my experience) you can size them down with very little fuss but I wouldn't bother.
I've got the 240gr. Hornady Magnums in .452. Have not worked up a load yet for the .460 using them. I did make up a dummy round. My lee factory crimp die did not like them one bit. The .452 cast no problem as expected but the .452 jacketed was a tough stroke. The mag style are a very thick jacketed design. A little shorter bullet in the case might work better. Maybe the .460 Starline brass is thicker closer to the mouth than their ACP brass. I just don't know. My OAL for XTP's is pretty much settled on. Due to magazine dimensions. Even .003 longer will jam them up.
Another thing is, we are not talking about using them at around 20k psi like the ACP. In the 30k range with no data available. In a 1911.
I am a conservative handloader.
