When shooting with a larger centerfire cartridge above about a 243 the barrel starts to heat up pretty fast. In calibers like 270, 30-06 and all magnums the barrels really heat up a LOT. If I am shooting 3 shot groups with a 270, or 300 wby the barrel is really scorching by the third shot even if I shoot slowly.

How long do you wait between shots?

What about after you shoot a group of three or five shots do you start the next group with the barrel still hot?

I usually take 2-3 rifles and cycle through them as the heat up.