I have to throw them because they don't always do what you would think. For example I don't know why I get more backend out of a urethane BooYah Pro than a resin Web Tour even with a ton of surface on the BYP, but I do. 

Hi Bowlers - When I rank cover stock as #3 that includes maintaining the grit level at OTB, or unique Grit Levels, or added polish / compound.  Each is unique to the environment that you and I are going to compete on!  I start with OTB and than fine tune grit for a particular lane read.  Talk with your PSO! Your thoughts!  Have fun - Gold Level Coach ABE Denny   

Ignitebowling, sound advise/suggestions, as I was gonna explain this exact route; Nailed it.

Hi Bowlers - Thank you for our responses.  This is a really critical point for each of us who are multiple ball bowlers.  As  Ignitebowling stated he segregates by High, Upper mid, Mid, and Low level performance.  This works for him.  I would like to fine tune performance.  The RG value defines one of the engineering performance ranges that we can identify with.  The RG ranges, bowling.com,  are Low 2.46 - 2.570, Mid 2.570 - 2.680, and High 2.680 - 2.80. For me I see the ranges as Low 2.46 - 2.50, Mid 2.50 - 2.55, an High 2.55 - 2.80.     So, Ignitebowling and myself are similar, I just like to use numerical values.  The referenced bowling.com ranges are to just great.  The key is that the Lower the RG value the sooner the ball will read the lane.   A seminar that I attended with Chris Barnes, as the speaker, on this subject stated that every .4 increase pushes the ball down the lane another 4 feet before lane read.  More to come - Gold Level Coach ABE Denny   

The cover is the number one factor in ball motion.  I know of balls with RGs in the 2.4s that are early and more roll (Gamebreakers) and balls with the same RG that are more skid flip (Violent Eruption).  For sake of argument; I realize the Gamebreakers come at 2000 and Violent Eruption comes polished.  However, even if you polish a Gamebreaker; it still wont be flippy.  This is based on my experience as I have both a GB2 Solid and Violent Eruption both with 5 inch pin to PAPs.

I just went through this with Strider recently regarding his Ordinance C4.  It has an RG in the 2.4s but he had a very hard time getting backend and continuation whereas his Venom Shock, also with an RG in the 2.4s, got down the lane and had a little "pop" on the backend.  The only logical explanation was the coverstock.  The cover on the Venom is cleaner in the oil and more responsive to friction whereas the cover on the Ordinance wants to read the oil much sooner which then means it doesnt conserve as much energy for backend reaction.  The Ordinance wanted to get into the hook phase too soon. 

In this video; you will notice that there is virtually no difference in ball motion from a 10 degree difference in VAL angle on a symmetrical ball.

https://www.youtube.com/watch?v=G2asGDu7THA

This video is very telling.  It talks about the 4 factors of ball performance (cover, core, layout, surface). 

https://www.youtube.com/watch?v=05HrbSt9gC0

I respect the fact you are a Gold Level Coach.  However, I will say this.  Getting overly technical with an average bowler will only complicate things unless they are really wanting to learn about it.  It is like using "advanced metrics" when grading a MLB baseball player.  Sometimes looking at batting average, HRs, RBIs, and errors made is enough because most people wont understand what WAR, Defensive Runs Saved, OPS+, and other metrics means.  I would rather know what the players on my favorite team have for a batting average with runners in scoring position than knowing what their xwOBA is (who really knows what that means without looking it up first).

EX:   Marcell Ozuna produced a .327 wOBA in 2018. But based on the quality of his contact, his xwOBA was .359 (taken from article on MLB.com).

 

The reason I don't look at RG values as much any more is most of the biggest go long and snap balls have lower RG values sub 2.50

Example ball has RG of 2.48  Diff .051 it should rev up sooner, the higher diff should help it slow down sooner and overall the ball should be great for heavy oil....Except the ball is a Phase 3 and is a skid snap monster.

This is why years ago I actually started looking at balls by performance category as needed, then read the manufactures "intended purpose" for the ball. Sometimes that isn't always clear lol but for the most part it is. If they say the ball is a skid snap monster despite the core numbers I will give them the benefit of the doubt to use on ball selection. It's paid off for me in ball selection especially across multiple brands since they all use the same high performance, upper mid, mid, lower performance categories.

It is just example when looking at core numbers alone they don't tell a big part of the story in terms of the ball. In most cases when the topic comes up on core numbers most of what is said about what RG and Diff do in ball reaction is true, but when you then add the coverstock you get ball reactions that core numbers alone would indicate something different then what is expected. (like the Phase 3 example when looking at the core numbers alone what the ball reaction "should be" vs when you say the ball core numbers listed is a Phase 3 and the ball of course isn't early and smooth and ideal for heavier oil conditions)

Look across any brand at their go long and snap bowling balls and a lot of them are lower RG fast reving cores. Which in most example on looking at core numbers for ball reaction would not be what is recommended for that reaction. 

If that makes sense.

Most drier lane balls they do raise the RG and lower the Diff to get the ball through the heads which you would expect like in a Hustle series etc

10 balls to league.....

Name shirt too?