Velocity Increase from Tuning
 

I spent some time walk back tuning the Captain yesterday. Mostly working with the left-right adjustment. In the end, I made a very small (1/16") adjustment towards the riser and the arrows are falling in a nice vertical column. Groups tightened a little bit too.

Here's the weird part: velocity went up 4 fps. I shot a lot of arrows through the chrono to make sure it wasn't a fluke. Do you think that tuning can increase velocity this much? Or, do you think it is just a chrono variance?

Absolutely it can increase. With a badly spined arrow or a rest out of square, you are wasting some energy. But with the arrow coming out dead square, all the energy is straight ahead. In fact, sometimes tiller tuning (which I don't do anymore) can result in increase of 5fps.

Why don't you do tiller tuning anymore?
And, how does it relate to cam timing?

It takes a lot of work. Cam timing is one thing, and your limbs slamming home at the exact same time is another. If you got both timed, its a beautiful thing. I am not talking about what Arthur P put up there. When i say tiller tune I mean take a 1/4 turn out here and there and group tune and use you hearing to think if it made a difference. Each time you take out a turn, you have to readjust nocking point. I have seen some actually use a hooter shooter to do this.

But I have made up my mind, I am a hunter. If I can pull off 3" group at 30 yards, I am happy.