You might add the epoxy cover to the list which was introduced with the EPX-T1, but failed, and it would IMHO fit in the aggressive/early reading range. Two others top add are IMO polyester and urethane (maybe pearl & solid) - but it is hard to judge where the urethanes would fit. They react more "even" than reactives, but offer a good read of the lane.
I'd be very careful with your ranking - you cannot generalize aggressiveness or responsiveness just based on a certain type of cover. Your list might work for the same coverstock base - Brunswick had and has all types based on the PK18 base - but the range of conditions a certain type might cover is huge.
There are e. g. pearl reactives that are very mild, while others are more aggressive than a particle ball! Coverstocks have become so aggressive that particle appears to become obsolete, and current high end balls start to have higher RG cores and lower differentials just to get the balls far down the lane, so that they do nor read too early for the everyday user.
Coverstock prep can also change a lot, as well as the "combo" with the core and also the setup through the drilling. You can create a lot of overlap. But, if you take this relative grain of salt, your list is IMHO valid, but very rough and cannot be generalized.
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DizzyFugu - Reporting from Germany
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Check out BR.com's vault of wisdom: the unofficial FAQ sectionEdited on 11/16/2007 7:03 AM