Rate of fire/temperature and the effect on standard deviation

[sniper79_98]

Good evening,

I shot two separate 5 shot groups. The first group was relatively fast at 100 yards. With an SD of 19.4/ES48. The second group was slower and shot at 425. This group had an SD of 10.7/ES of 33. I know barrel temperatures effect velocity. During load development or shooting in general, does rate of fire effect the SD of a “decent load?” Side note: my Chrony is older and doesn’t seem to be as consistent as it used to be.

 

[Bullspotter]

Interesting. I never really though about the barrel heat affecting the bullet speed down the barrel, dose it take more-less force to push though when hot? I Have seen warm chambers heat temp sensitive powder, gaining in velocity on a chrono. Looking forward to what the more knowledgeable shooters will say here!!