Difference in compression.

[powderburner]

   
These bullets are 30-1 recovered at the 300yard berm fired on two different days with the same charge of powder .OE 1.5 90gns. The only difference was 60 tho more compression on the left one .the cases were dirty and some were really full of fouling with the right load and the left they were cleaner and more consistantly, fouled .
It is interesting to me how much difference 60tho compression made with this load .