The Haymaker rifle looks like a 1770's or 1780's rifle to me. Gary Brumfield could give us better information on that. Added in edit: looking at the site where the Haymaker rifle is featured, it says the owner of the rifle was killed in 1774. So there ya go, it is pre-Revolutionary.
Now what I wrote below may be superfluous:
When I see longrifles that look like longrifles it causes me to doubt they are pre-Revolutionary. I now expect 1765-1775 rifles to look oddball compared to a Beck or a Lancaster Dickert for example. The discovery of several 1770's dated Oerters from Christians Spring is one of the things that has changed my thinking. If you get to see these guns in person they are massive, muscular Germanic pieces, not sleek looking longrifles. If they were not dated or attributed to Oerter most would think they were earlier guns. Certainly there was no uniform progression in style changes and the Moravian rifles may be more "rootsy" than other contemporary pieces, but still, I have trouble reconciling what the Moravians were building and selling with the idea that other gunsmiths were selling sleek longrifles at the same time. But it's probably not good to overthink these things. I do know that folks often wish certain rifles were pre-Revolutionary. Since the 1980's there has been increased interest in the pre-Golden Age rifles, and the earlier a rifle is attributed to be, the more it can be worth. If wishes were horses, beggars would ride.