What sloppy shooting! Only thing I can see wrong with that target is that you missed a decimal point when you wrote down the distance. I believe it was 3.00 yards and not 300. I say that because you can't shoot that good at 30.0 yards.
And another thing, you couldn't make a hole that big in a target with a cannon let alone a flintlock!
I bet you're also saying that you used open sights too huh?