Normal hand, middle finger is longer than ring, but when placed in a bowling ball my ring finger is actually further away from thumb(righty). however, I do know there is a technique in drilling called "dropping the ring finger" (shortening the span)which some people prefer. One driller did that to a new ball of mine, without telling me about it, and screwed up both my game and the ball until I figured out what was wrong. This was in my earlier days in bowling before I had any knowledge of drilling. I am a high-tracker anyway, and that dropped-ring finger caused me to track over fingers AND thumb-holes, and the ball(killer instinct) wouldn't hook two boards! After taking ball to new driller, and finding out where the problem was, I started doing my homework on drilling and layouts! The up-side is that I found a new ball-driller(Billy Rohde) whom I trust implicitly! He does EXCELLENT work, and will talk with you and explain everything he thinks would be right for your style, type of ball, and lane conditions you plan to use it for. A little homework can really keep from having mistakes happen on $100+ piece of equipment.
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r.k.wolfe