The solid copper shank part of these bullets are quit long in relation to the overall length and I am wondering if the elongated exit holes are from the bullet starting to tumble/turn over by the time they exit. I have seen recovered mushroomed bullets be heel against the hide on the off side some times.
Saw this on another site, email from Barnes about this bullet
The 6.5mm 127gr LRX requires a minimum impact of 1600fps for initial (beginning) expansion. Compared to the 6.5mm 120gr TTSX that requires 1900fps for the same beginning expansion. We suggest an impact velocity of 100fps to 200fps higher than these values for good bullet expansion and subsequent good wound channels.