Unique hotter?

[44MAG#1]

As far as humidity getting into a closed plastic can, ambient temperature changes can cause a partially filled container to "breathe." Once the seal is broken, there is no guarantee that air will not be moving in and out of the container until equilibrium with the outside air is achieved. Powder in the hopper of a measure will also equilibrate with the ambient air, before it is returned to the container.

Wayne

So what do we do with all this breathing containers and equilibration in reloading?
How do we manage?
I'm 70 now and started reloading just before I turned 18 and wonder now how I did it. The more I learn the less I know.
I see some strong nerve pills on the horizon.

[rintinglen]

Here is a list I came up with on the variables on velocity variation that make it even more difficult to comprehend one results when chronographing.
If any one knows of more feel free to add them.

1. Lot to Lot variations in powder. MAYBE
2. Lot to Lot variations in primers. MAYBE
3. Humidity effects on powder.
4. Temperature effects.
5. Air density.
6. Inaccurate scales
7. Inaccurate reading of scales.
8. Different amounts of bullet
In case. Although same
Weight bullets
9. Amount of crimp.
10. Amount of neck tension
11. Different case columns
12. If low density loads where
The charge lays in case.
13. The need of a fresh battery
In Chrono.
14. Improper operation of
Chrono.
15. Different barrel length than the loading data used.

16. A different barrel of the same length.

17. The same gun 2,000 heavy rounds down the road.

[44MAG#1]

16. A different barrel of the same length.

17. The same gun 2,000 heavy rounds down the road.

Thanks Ill add those.