To answer the OP's question, the equipment has the capacity to make hits at 100ft but positioning and timing would have to be perfect. I feel that 60ft or less is more the average distance for consistent hits. Keep in mind testing with two stationary tanks vs. two tanks in an actual situation moving and maneuvering will yield quite different results.

And with regard to Danville battle rules, perhaps you should start a new thread on it. I had a bit of an initiation when I first rocked up two years ago and can share my experience and observation which hopefully helps you.