Perhaps the yawing Barnes is the result of too rapid a twist?
: On a close shot, we haven't the luxury of allowing the bullet 100 yd. or more to "Go to Sleep" before impacting, somthing most bullets require, whether Barnes or any other make. It is entirely possible, that a slightly slower twist would allow a stable 'launch', but then, I've not a rifling machine nor the money for multiple barrels to do this 'test' witb. I am thinking of large bores here, and certainly not anything smaller than .375.