I doubt its the length as you are running a 9 twist. If they don't shoot well at the lower speed of the Barnes (that might be where your accuracy node is on your rifle), I'd just use them up for off-hand target practice or short range hunting and stick to the Barnes. It's sometimes the case that no matter what you do, the particular brand of bullet does not like your particular gun. I'm very fond of the 90 grain TGK that has an excellent bc and performs well on game and are accurate, at least in a .243 case.
