CK Thunder tunning help ?!?

[36873687]

1 hour ago, racer-x said:

 

That is not my experience.

 

I've tested this many times over the last 2 years with multiple guns. This most recent same day test is with my Atlas Chaos using identical ammo (range brass).

Results have been similar with my other guns in outside temps between 29 - 104F. I've seen bigger differences between lots of the same powder.

 

 

Just 30 degree swing. I know guy that done freezer test. Hotter it gets the faster it gets.maybe u just lucky or I’m ocd

[racer-x]

2 things I notice with these results.

1st 10 shot group @ 39F temp is with small pistol primers and has a 70 ES. Something was off (inconsistent) with the loading of these rounds - most likely powder drops. 

2nd group is smaller 6 shot string using small rifle primers. ES is at the top end of OK, but rifle primers will yield higher velocities with lower ES. 

 

Here are results of a primer comparison test I did using SPP, SPM & SRP in otherwise identical loads. Barrel was not clean at start and gun was allowed to cool between strings.