Bob, I have personally seen 55 gr "lead" bullets chrono over 4,000 fps from a 26" barrel. Of course velocities certainly do vary from rifle to rifle and especially with different barrel lengths.Since the non-lead bullets are normally longer, I am wondering if even a lighter bullet, say around a 40 gr or so would work well? Then again, that may not be necessary with the usually faster twists in 6mm anyhow? Just thinking out loud. Anyway, me being a speed addict would absolutely look forward to the new 55gr non lead bullet.