7mm-08 Hornady Superformamce CX 139 gr. Question.

I've found with mono copper that the faster you drive them to get the impact velocity up, the better they perform. Even though they expand at velocities below 2000 fps, the terminal performance may not be what you expect. I limit my shots to where I know my impact velocity is above 2400 fps when I use mono copper. I know this is conservative, but that's just me.
Smart move on your part for keeping your velocity above 2400 FPS.
 
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