I've got both Sierra's and found the 142's to be much better than the 140's as I found the 142's easier to find a good load and I get much more consistency out of them. I'd say the 142's are better designed with the longer boat tail and being tipped (where the meplat has been reduced significantly) and you can easily see the different just looking at them. The 142's also have a seeker ogive than the 140's. Have quite a few of the 140's, I'll just use them for fire forming and short range practice. The 142's are doing quite well for me at the longer distances, but haven't gone to 1000 yds. with them yet.