Open load did not make major

[jarozzy]

This weekend was the Missouri Fall Classic in Rolla Mo. It started a 8am and the temp was around 30-35 degrees in the morning and then 50 in the afternoon, my squad was first on the chono. Me and another shooter were shooting open with the same load except for the bullet make, mine was MG 124gn with 8.1gn of HS6, both of our loads did not make major he got 162PF and i got 163.7pf. The other guy shot this load at double tap this summer and chonoed 175 (I think) it was around 100 degrees. I did mine at home with a PF of 170 at 75 degrees. The only difference I can think of is the temp. Will colder temps affect HS6 this much, could we have made major if we chonoed later in the day at 50 degrees vs 30. I would like to hear what others have to say before I start changing things, as this was my first match with an open gun, and still learning.

[Alaskapopo]

Temperature changes affect all loads to a degree some more than others. In Alaska I notice this quite a bit and have to becareful of developing loads in the winter and then using them in the summer.

Pat

[HoMiE]

Did they collect your ammo and was it sitting out in the cold in the morning before you chrono'd?

[jarozzy]

Yes it was sitting out before we chono'd, but it was not sitting out long i would say 20-30 min at the most.