Nice article John.
I've never bought the line that BTs lose their core / jacket more than FB bullets. While I've not documented recoveries of bullets like you, my casual observations echo your notes.
I also think for rough and ready handloaders like me, boat tail bullets tend to be easier to seat straight in the case because they start into the case mouth so easily. Whether due to this factor or not, I tend to see better accuracy with my BT handloads, all other things being equal.
Not sure that last bit holds water, but I'm going with it until proven wrong!
