I have heard a lot of shooters say "I hit here yesterday, but it was 6 inches left today, or 4 inches low".

IMO what most MZ shooters do not realize is how much the weather effects your MZ shooting. The old timers that taught me was to only sight your rifle in with a "snow test".

I think the old timers were right. I know it is tougher to go to the range on the bad days, and the cold snowy days. But those are normally the types of weather you are hunting in.

I have noticed weather can makes some big differences on POI. However IMO the moisture content(humidity) is more important than temperature. Just as long as the temp is not too high. IMO too high is over 70 degrees.

Keeping your powder at a consistent temp. and moisture content is a lot more important than what most people believe.

Basically I use 3F powder instead of 2F because I think it has a more consistent burn rate. And I also shoot 130 grains as a max. load instead of 150 grains-I believe there are weather conditions that will not allow the 150 grain load to fully burn. I have seen conditions when I could not get the 130 grain load to fully burn. Tom.