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In the BIG picture of things, the core actually means NOTHING as far as striking goes.  The core itsself has NOTHING to do with the pins, the C.O.R., or the pins interacting.  The core makes NO strikes. Strikes are created by the balls interaction with the pins.

  This being said, what the core DOES do, is allow balls to create sharper entry angles from deeper positions on the lane. They let balls take full advantage of the aggressive coverstocks that have been created, also allowing them to do this in much higher volumes and lengths of oil.

  Striking is merely a function of getting the ball into the pocket area at the proper entry angle with enough rolling force to maintain the proper trajectory through the pindeck.  It doesn't matter what the cover is or what the core is.  If you could get it into the pocket with enough angle and roll, anything will strike, cores just make it possible to generate these forces from angles not seen before and with less effort than ever before.

  There were 300's, 800's, and even a 900, long before the advent of reactive resin and gyroscopic weightblocks, just less of them because it was harder to generate enough roll and entry angle with enough force and precision to strike on a day-in day-out basis.

 P.S. You take me back to the 1980's and I'll show you how to score off the five board with a pancake cored Columbia Yellow dot.  ( I miss the 80's )
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Edited on 2/2/2009 7:33 PM

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Here's the only caveat I'd make to that, and it's something I've still yet to see anyone address with a test: Stability through the roll, core vs. core.

This means simply that, given a ball in the rollout phase, which ball is less likely to be knocked "off-kilter" once it impacts the pins. Common sense would say that a ball with more mass in the center should be able to hold up to the forces of deflection better than one with more mass near the shell -- i.e., the difference between core-heavy balls and pancake core balls.

This is a different measurement than which core promotes a later break/greater entry angle. What I'm talking about is if you take two cars of equal weight, and jack one up so that the center of gravity is raised, it's easier to knock that car on its side because the raised center of gravity makes it less stable. Ergo, if you raise the mass of a core more towards the shell, deflection should have more effect. And at that point, even the position of ball at impact with the pins (i.e., core "behind" the ball or "in front of" or "on top of" the ball at that instant) becomes a factor.

Jess

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