Pretty certain mine measure 1.721" HPBT Scenars are a touch longer than the OTM scenars though, so double check which ones you have*
I didn't realize there was even a difference til I found myself with 300scenar OTM's (and) 300scenar BTHP !!! ...never occurred to even "look" if the "300 scenars" I was buying were the same until it came time to measure COAL. There's a very-big difference!
HPBT must have been the 1.721" that I wrote down.. there was 10 thou difference in COAL between the two, and if I recall right like a 50 thou difference in seating (when leaving the die set in one-spot) ..my OTM's like a 0.015" jump, and with the die set "there" the HPBT's were actually jammed in the lands roughly 0.050" Shot okay. But obviously not where you'd want to leave them as a finished-load!
I like the OTM 300's much better. You've got the good ones.