Wind wasn't hardly blowing, and not enough to cause shot that far off. I'm thinking it was shooter error. Thanks for your reply.
I have always found that if the 5th shot flies out, it was me getting excited behind the gun. If the flier is in the middle of the string, then it was a wind call or ammo issue.
"No wind" is the worst. The smallest of gusts can suddenly move things a lot, ruining a great group. I always shoot tighter when the wind is blowing steady; I have a way easier time telling a slight change to a 5mph wind vs feeling out if a slight gust is coming in a calm condition.