Copper bullet testing?

This is new information to me. I sure am glad I haven't heard this before. I have been using Barnes TTSX 110 and Hornady V-Max 110 bullets at the same range session. I did that because their BC's are so close. Here are some groups fired on the same day. The first one is the Barnes. The second is A-Max. I don't know what's with the blue. Both were on white paper.

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20170331_083156_zpsu5rgchaq.jpg

If you would have cleaned your barrel before shooting the second group, you would have gotten 1/2 inch groups (just kidding)- that's a great group !!
 
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