I was giving you an out man...
Copperheads have a much wider patten, and the usual "Hershey's kiss" design where it is wide at the belly and extremely narrow at the top of the back.
What you have there is a Great Plains Rat Snake.
Being a bit of a snake hater myself I learned which to kill and which to leave alone. I did just kill a cotton mouth two days ago in the swimming hole below the house that the girls were about to jump into...I feel you. Anything that looks like a threat...dies.
Copperhead for comparison, and 99% of them look alike:
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