John,
The one variable I question is primers. I noticed that often Ramshot load data shows standard primers over magnum primers.
I started out before hunting season with an Accurate ball powder in my 7-08 and standard primers. In the warmer weather it was a 1/2" combination, but when got cold it opened up. Out of concern I switched to a stick powder.
If I had started with magnum primers, would I have been more likely to maintain groups in different temperatures?
Aaron
