well i checked the canadian tenpin federation website and it says anything that usbc has approved
from the official website:
Bowling Ball – Approval**
Bowling balls used in CTF competition shall:
1. Meet USBC equipment specifications at time of manufacture.
2. Be USBC approved.
3. Meet the following USBC specifications.
and rechecking bowl.com i dont see anything related to x-out balls
--------------------
When a house bowler misses the mark, misses the break point and strike, for many ppl its called a wallshot. When a pro does that its call adjustment
When a house bowler gets his finger stuck in the ball and fall on the lanes, for many ppl its called lame bowler. When a pro does that its called the Machuga flop! ha i like this one.