From along time ago....but I did a 14 day float trip moose hunt in AK and spent about 11 days on the water. It was just me and my good hunting buddy. We were in and out of the raft all day long and it was extremely cold. The person hunting would be in the front ready to shoot and the rower attached their rifle to a float on a rope. I grew up in the ocean and love to dive and snorkel, but there was no jumping in the river to retrieve things. It was just above freeze and filled with silt.
I brought a Glock 20 on this trip. I had a good holster, but loading and unloading the raft knocked things around and made me constantly check my pistol. I think the next time I go back I will bring a revolver. We had troubles at night with bears (please don't turn this into a bear thread) and I was worried that if I had to shoot my 20 from a sleeping bag inside the tent it would jam. Also, the gun was hard to find in the darkness of the tent. When I go back in a couple of years I will have a Bowen lanyard ring on a Smith N-Frame or my Ruger Alaskan. If it ends up being a pain I can always just remove the lanyard. I think it will be nice when we are on a raft and at night the lanyard can be used to help locate the gun. It would be very easy to attach a small chemlight to the lanyard.
There are pros and cons to lanyards however I still think they have value.
Here is a pic for perspective.
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For the safety folks, the rifle in front of me is pointing up, not at me.