When reading articles about choosing bowling balls, I often see references to low, medium, or high RG and differential.

What are the approximate ranges for a low, medium, and high RG? Would the following be close or am I way off?

Low RG = 2.46 - 2.49
Med RG = 2.50 - 2.53
High RG = 2.54 - 2.58

What are the approximate ranges for a low, medium, and high differential? Would the following be close or am I way off?

Low Diff = 0.026 - 0.039
Med Diff = 0.040 - 0.053
High Diff = 0.054 - 0.069

Thanks

Well, looks like you have the text book numbers. Now, in how to use them to your advantage is the next option.