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  1. I finally heard back from the USGA on my question. To close the loop, while the USGA measures spin in their conformity tests, they do not use this data for these ratings. These ratings (as Angry Yeti postulated) are merely subjective OEM ratings, meaning a M ball could in fact be higher spin than an H ball.
  2. I have seen the test protocols before, but not the video, thank you. While you may be correct that L M H are taken from OEM literature, I would be surprised if that were the case. I understand they are not testing spin for conformity, but they could easily categorize the balls based on their readings. Doesn't look like anyone knows for sure (at least not thus far), so I will hope that the USGA eventually answers my question. Thank you for the link to the video.
  3. Yes indeed spin on any given shot is player and strike dependent. That is not what these numbers are. They are representative of the ball's relative performance in general. How wide a range the M is would be valuable in comparing balls for some so inclined. You may not be that person, and I completely understand that, but I most definitely could extract value with the numbers.
  4. You got it: RPM for each rating. May help some (would definitely help me) with ball understanding and potentially focus selection based on extrapolated personal launch monitor spin data. I can appreciate where the letters only would certainly be beneficial to most.
  5. That is indeed the list I am referring to. My question was about the RPM ranges for L M and H spin categories. Would add context.
  6. USGA lists golf balls on their conforming list as L M H spin for driver and short iron. I can't find anywhere that states the RPM ranges for these categories, and they have not answered my inquiry. Does anyone have this info?
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