Cold bore or fouled barrel.

[Mtnwalker]

Well made to the range today to shoot a fouled cold bore to see how it grouped with the 5 other rounds.  It grouped very well.  at 200 it was within shooter error which was 1 inch right of point of aim. ES of 19 and SD of 7.1.  Not thrilled with that but not sure where it's coming from . Looking at a new scale maybe or trying to figure out how to hard reset my Chargemaster 1500.  Had it for 10 years so maybe I need to upgrade the scale.
speeds
1 2935
2 2952
3 2933
4 2946
5 2942
6 2950

That ES and SD are just fine if the rifle is grouping well.  An ES of 30 or less with SD in the single digits is pretty darn good.  👍

you are probably right but you know how that chasing your tail thing goes.  If I don't settle soon I will burn this barrel out haha.  Three different powders, two different primers and two different bullets.  I am going to shoot one more ladder and I give.  It is shooting very well.

Agreed, you're talking less than 3" of vertical dispersion at 1000 yards with your 19 ES. Unless you just enjoy tinkering

[Crunchy]

For those following the journey 
Ran a ladder  from low to high and then high to low after letting the barrel cool.  This was with a clean bore and took two foolers before starting.  Ive been shooting at 66.4 but now thinking maybe I should be at 67.1ish.

66.1  2928.   2933
66.4. 2929    2947
66.7. 2956.   2951
67.0. 2964.   2963
67.3. 2971.   2958
67.6. 2993.   2984

[Lowedog]

Hornady has several podcasts on the subject of group size.  You may already be aware of this...