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For anyone curious about the design
The bullet is designed to have a super high BC. Water is such a dense fluid it will sap energy from the bullet 784x faster. This is also why they went with such a slow cartridge design.
Drag is a function of velocity squared. So if you had a 10g round going 100 m/s and a 5g round going 141 m/s they’d have the same energy (100J). But the 5g round would lose energy at twice the rate.