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Old December 6th, 2011, 22:23   #21
ILLusion
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Join Date: Jun 2002
Location: Toronto
I've always stuck to:

<300fps: Extra Soft
300-350fps: Soft
>350fps: Hard

But you're right, there is some overlap, and the rules are not completely defined and set in stone. You can definitely use a Soft rubber at 400fps as well, but you'll just have to turn the hop up a bit higher to get it to engage.
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