Based on the article and discussion on 68caliber.com, the ASTM standards for maximum ball weights for different calibers have been revised. Mike Lukas, Chairman of the ASTM sub-committee for paintball posted a very good response explaining the decision-making process in forming the ASTM standards – the full text can be found here. I really suggest you read the whole article, as it seems that the weights that were initially posted were early inputs to the standardization process. However, the wording of the outline has now been revised to be more accurate in proportions of the weight to the ball volume.
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