Not all copper bullets are the same, but most of them require higher speeds to open, are less prone to fragment, and generally result in much smaller wound channels. If you are truly limited to non-lead, you may want to look at the DRT bullets. They tend to perform about like a Berger and probably have about a 2000 fps lower impact velocity for them to fragment. Probably the best available non lead bullet on the market right now.Last year I tried copper with my 6.5 creed. Learned a lesson from that. 6.5 and copper dont mix. It is too fast and at 80 yards i shot a buck a bit behind the sweet spot and it just stood there. I took an additional shot and hit about 2 inches lower. The buck moved up the hill about 30 yards stopped and turned and looked back. Hit hit him again through the neck and he took off. Tracked him with my hunting partner and found him down next to a log. As we were about 10 yards from him he jumped up and took off my hunting buddy dropped him for good with a 300 win mag. All three of my copper 6.5 creed went in and out of the buck the same size hole.