I'm going to go ahead and say it:
There is zero chance it was too big for your snake, and I bet your BP could have taken three times as much in a single meal.
That's not to say overfeeding is a good idea, especially regularly, but feeding a slightly large feeder for a single meal isn't anything to worry about.
If he didn't regurg it, it wasn't too big. You'd be surprised what these snakes can put down.