oldsmellhound
185 grain Lehigh - I have shot a bunch of them... they are a re-disigned .40/200 grain built to be shot in a 1/28 twist. They do shoot very well from my Triumph and DISC.
The calculated (mathematical) BC is only .155, but believe me they fly better than that. I believe Grouse has actually ran the ballistics on them but I am not sure what he found.
Also remember Lehigh offers a sample pack for you to try... think it is $12.
1500 fps is the number... but also remember if you are less than that the bullet will still open and act as a normal expanding HP. If the petals are bent beyond 40 degress they will break but up till them they just flower. And that number is a the POI.
I did shoot a nice buck @ 77 yards with the bigger .458/275 grain Lehigh, it was a neck shot. Lehigh Dave had assured me that the bullet only needs 2" of animal to open and after the neck shot i believe it...