If it were me, versatility would trump the noise increase. More important than the diameter difference would probably (I'm supposing here) be the loads you used.
I agree. Even though I dont shoot .45acp, I would like to get a .45 suppressor to use on my 9mm and eventually a .45, and a 7.62 suppressor to use on my 5.56mm and eventually a .308 and 300BLK build.
Nov 2, 2011 sent form 4, SS Sparrow. Arrived May 29, 2012.
Jan 30, 2012 sent form 1 for SBR. Arrived July 12, 2012
Jan 22, 2013 Sent form 4, 762-SDN-6. Arrived Sept 13, 2013