So I went today and shot the 280AI again. a month ago I shot it and put three bullets in the same hole at 100yds. Today I went with the same load and got 1" to 1 1/4 at best. H4831 powder and 140 grain ttsx bullets. I cant see what went wrong. temperature was hotter today but I had my loads in a cooler with ice. I thought H4831 was temp stable? Really frustrating.