Mule Deer,
You mentioned the groove on the E-Tips improved accuracy. I spoke with a technician at Barnes, and he stated that they test accuracy both before and after the grooves are added to the TTSX bullets. He was not sure the mechanics, but relayed that accuracy almost always improves after the grooves have been cut.
Federal adds grooves to E-tips for their Trophy Copper ammunition. In my limited (7mm-08, 270 & 308) experience, the Barnes TTSX and factory Trophy Copper both are more accurate than factory and hand loaded E-Tips. Again, just my experience with my rifles.
Do you think there is any correlation between the added grooves and accuracy?
