True story.
I bought some 200grn plated SWC's a few years ago (when bullet selection was 'take it or leave it.' I have 2 4" Kimbers... the steel ProEclipse, and the alloy ProCarry... basically, 2 identical pistols, the only difference being the frame material. The SWC's went down the Eclipse tube like a fat kid on a playground slide (after he ate all the candy...) but the Carry gagged on them about 1 in 5 times. I have since gotten away from SWC's in the .45, and just stick with the tried and true RN's. Sad, because when they shot, they shot very well, and, as was mentioned, left nice round holes.
I would think heavier would be better, unless you are just looking for cheap thrills.