Here are the case weights and their water capacity for the 3 different cases I have:
Fed.
empty case = 204.9 gr.
water weight = 68.7
Win.
empty case = 192.0 gr.
water weight = 68.8 gr.
L-C (mil)
empty case = 197.2 gr.
water weight = 68.6 gr.
The capacity differences between the 3 cases are statistically insignificant. I guess we just need to leave it as an unsolved puzzle.
To paraphrase the old carpenters rule: "Measure twice, explode never."
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