I picked up a Roto-Grip Empire 2nd from bowling.com.  Here's the ball facts from the website:

http://www.rotogrip.com/products/balls/ball.asp?ballid=94

They list the rg at 2.5, the differential at .55, and the mass bias differential at .012.

The pin distance is loooooong on this one.  The pin, mb, and cg are all in line, but the mb is 7 inches from the pin, and the cg is 9 inches from the pin.

I was thinking of using Mo Pinel's dual angle technique and using a 20 degree drilling angle, and a 30 degree angle to the val, placing the pin about 5 inches from pap, and going with a gradient line balance hole at P3.

My hope is to end up with a forward rolling ball that revs up quick, and still has a good pop at the end.

Am I way off here?  Do you think I should just follow Roto-Grip's asymmetrical drilling guide?

Any advice from you experts would be greatly appreciated.  Thanks!

Edited on 8/24/2009 6:42 PM

with a 20 degree drilling angle, i would think that ball will be DOA by the time it gets to the back of the lane.
--------------------
"USBC is concerned that technology has overtaken player skill in determining success in the sport of bowling"