I would be curious to see how much velocity you lose to the faster twist barrel. How long is the barrel on your VTR? Both of my .223's are 1 in 12 twists and pretty much made for the 40 thru 55 gr bullets. I can push the 40's over 3600 fps in the 26" barrel Remington without too much trouble, and 3500+ is achieveable in the 22" Howaby Vanguard Varmint. Of course, I have no idea if my rifles could even stabilize a 60 gr bullet, much less a 68 gr. I have heard that the 1 in 9" will handle up to the 75 gr Hornady, but curious to know how much you will give up with the lighter bullets.
