Is this an indication that the jacket is separating

[Csitt]

I was testing some TNT's this weekend. Was looking at the grouping and noticed the webbing outside the holes. That brown staining
PSA 18" 1:8
A2200 Powder 29.0gr
New Starline brass
COL 2.220
Velocity 2816
75F outside
[ATTACH=CONFIG]18911[/ATTACH]