Deny is dead right on July for a 20. June has too high a probability of enough east/southeast wind to make a 20 crossing a very unpleasent endurance contest.
If you are not experienced with a sling, take a pole gun, minimun 7 ft. The sling has a lot better range, if you tie your own elastic, and is easier to carry around, but takes a whole lot more skill and practice to use effectively.
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