When I first worked up the duplex load I took another fellow to the range who wanted to do some chronographing. This was many years ago before everyone and his brother had one. He had a nice 7X57 firing 175 grainers. His scope was way nicer than my Bushnell 5-20X being as how it was a Geman made. The name started with a "K".
Kahles? Bt that's an Austrian outfit, though, I think.
