What I personally do. Not saying it is right or wrong. So interested in what others do.

When testing rounds in a double rifle, building up new reload formulas, or just trying it out to see if it is regulating, etc.

I fire the first two rounds. In the past used to load one barrel at a time. Often would walk out to the target to mark the impact before shooting the second barrel. I can do this as it is a private home range. And then walk out to mark the second shot. This probably means substantial time between each shot. Though sometimes I would shoot both shots before going out to mark the impacts.

Now I think this was wrong. I should always shoot both barrels soon after each other. Then walk out to mark the targets etc and let the barrels cool during the walk before new twin shots. I need a spotting scope to visually mark the right and left impacts though which I do not currently possess.

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Tell us what you do and the reasons why? Thanks.