The free Berger program from there web sight has worked well enough for me to make first round hits all the way out to 1000 yards.
The very first time I used it.I used it on a steel crow at 850 yards.Just something about a first round hit from a cold clean barrel...
I used the G7 data from Mr.Litz book.
My 30 year old Ohler model 33 is pretty accurate.
Hint.... get a good chrono.

dave


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Only accurate rifles are interesting.