Robo,
The other roomies replied to your second question ... I have input on the first; the coverstock/core combination of those two balls is causing that difference ... particle pearl versus the load on the Big Bang, as well as the core shapes. Check out the web site and compare ... just my opinion.
(BTW, my BP has a bigger backend than my BB too).
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**** Official "L/LM ball junkie" ****
Man, I LOVE this game; and I love it even more now that I'm using LEGENDS/LaneMasters equipment !!!
"Master the Lanes with Legendary hitting power" !!!
Robb in O'Fallon, IL 62269 (near Scott AFB)
LAYBZZ74@AOL.COM (Email and PayPal addy)