I had my chrony at the range last month and a fellow was shooting his .338 Fed and handloaded 180 TSX bullets. I let him setup and fire several rounds through my chrony. I was a bit surprized to find out it only registered an average 5 shot group at 2485fps.

I would have though that it would have done at least 2650fps but not so! I'll stick with my .338/06 and 210 grain Nosler Partitions. I get 2680fps using IMR-4320 powder!
If I shoot 180 Accubonds in the rifle, it's velocity jumps up to 2950fps, which I believe is a whole lot better than any .338 Fed loading is going to be able to match.


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