the difference between 15 and 16 NOW-A-DAYS is that you leave more back row pins with 16. This is due to the fact that with new technology in balls, they drive so hard, that 15 seems to be the perfect weight, 16 tends to drive a little too hard sometimes. Im actually thinking of going to 14. But if you feel good with 15, by all means go to it. Most people throw 15 now.
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"How small is too small?"
"Well, if you can masturbate with a Barbie hand, your in trouble."