If the 223 case has a lot of space around the outside the water will be pressuring down the sides of it rather than into the case and out the bottom end, is the case loose in the water chamber? Try sleeving it and see if that fixes things
If the 223 case has a lot of space around the outside the water will be pressuring down the sides of it rather than into the case and out the bottom end, is the case loose in the water chamber? Try sleeving it and see if that fixes things
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