I laid one out pin below my middle finger, which is 5 inches off my axis. Ball clears the front easy and makes a hard arc off the spot. I knocked the surface down to 4000. I generally don't keep anything shiny. The 503C is money on any medium oil shot. Let me know if you have any other questions.

I drilled my 503C 60 x 5.25 x 65.  This puts the pin under my middle finger.  I only have about 9 games on the ball so far so still learning what it can do but my initial impression is that it has above average carry and it gets thru the heads extremely well and makes a real strong arc at the back.  Very strong on the back for a C ball.  Hopefully my initial impression will continue as I use it more but real happy with it so far.