It's between 265 Swift and 250 Barnes XPB so far for me. I have one with each and want to try them both again! The Barnes expanded just like you read about, but did not get full penetration. The Swift gave good penetration and good accuracy in my FA 83.
I had good results with Nosler's 260 Partition in my 45 Colt, but Can't find any more
"If you are going to go through all the trouble to put a hole in something, why not make it a big one?"