Do you continue to experiment with loads ?

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Of course. What good would it do to develop a load at 100 yards and never shoot it again. Just a starting point. Maybe, I am missing something in your last statement?

Exactly! Once I develop a good load, especially a hunting load, I go to 300 then 400 then 500. Some real surprises can occur, when you get past 300. I have had some very accurate loads at 100-200 that were not that hot at 300+. In fact some were downright awful.