Oh oh - two squibs.
I use the numbers myself 1,2...3,4...5,6...7,8...9,10...reload...1,2...etc
Think about this.
Instead of 1,2...3,4...5,6
If you have 3 targets in an array, 123456
If you have 2 targets then 3 targets, 1234...5678910.. and so on.
It may help not program a pause in your shooting
Key word here is think, making noise during a walk through can be distracting to other shooters.
By the way that is one badass squirrel!!