Add me to the "no" list. I recommend not chambering a round until reasonably certain that the weapon will be fired or if your reactionary hand is going to be occupied, say, trying to herd a kid. The chamber can easily be charged while bringing the gun into a firing position - there is no loss in time assuming you can do two things at once.
Once you've chambered a round the typical shotgun isnt drop-safe, and in a tussle the last thing you want is for the gun to fire if you cannot control the muzzle, nor do you want the hood to get it already armed.
The only evidence that it'll cause someone to back off is anecdotal and qualitative. Remember, bad guys arent known for their good decision making skills
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