Just asking this question out of interest and see what people do.

When checking your rifle's regulation and groups from each barrel, how long do you wait before firing the third and fourth shots, and then the fifth and sixth shots?

Assuming four or six rounds are fired to test it out.

ie your shoot your left barrel and then your right barrel (or your lower and then upper barrel in an U/O). You shoot these two barrel fairly quickly, leaving a few seconds gap before the second barrel.

You want to now shoot a third and fourth round, and perhaps and fifth and sixth round. How long do you wait between each two shots? Do you let the barrel cool off substantially? Or not? Also do you shoot the first two rounds from clean or dirty barrels?

Just interested. Please explain the reasons you do it particular way.

Thanks.