I have a 7 rum that i have been working up loads for. I am in Central PA. I have a few topics I would like to hear other guys speak about. First I'm debating about load development in the summer months compared to winter shooting months. I mostly test loads in the heated summer days. Where I hunt , Snow is on the ground 80% of the time during rifle season. I am up in the air about this? Do other guys take the time out of the winter rifle season to sight in loads? This gun will be a 300 plus yard gun only. nothing really closer then 300. Anyway im dumbfounded with this. Second . The guys that do shoot l.r. and reload are you using a chrono to test loads? If so at what distance are you testing at? I have read articles about chronos and im undecided? I have a round i like as of right now. It was tested in the summer. 100-300 yard test. I would love to test loads at 100 and 500 yards in the winter and then get leupold caliber specific knobs.