While I haven't used the Lee bullet, I have used a 175 SWC by the now-defunct Lane Bullet Company. I can tell you that any long-nosed SWC has to be loaded short to make them reliable in these guns. If you DO load short, be sure to adjust the powder charge down accordingly- you have a condition similar to "set-back" from the get-go.
Our XD-40's seem to prefer "truncated cone" type bullets; if this is the one you're talking about, it's pretty close to a TC already:
I'd be real tempted to try this one if I was into casting.
I have since gone to Magma Engineering's 40/180/FP bullet, loaded over 4.3 grains of W231, to an OAL of 1.125 inches.
This is a nice, low-pressure load that doesn't strain the brass (important if you are using range brass). It runs smooth as butter and shoots real well. I'll post a 50 yard target I shot offhand with this load the other day, when I get some time.
Only thing I don't like about the load is that it smokes to beat hell, but lead bullets & 231 always do- I just shoot 'em outside.
Hope this helps you some.