Hey, whatever works for you, is fine by me. What you describe isn't even shooting groups though. Is it? Practicing first shot from cold/clean is great.
For me though, no, what you describe doesn't serve "my" purpose. "If" I'm going to take a second and even a third shot with my hunting rifle, chances are, the critter isn't sitting around while I let my barrel get cold between shots.
I shoot groups to see what kind of groups the rifle is capable of though. Not to practice first/cold/clean. Second, third shots, with a hunting rifle, in my world are likely quick follow ups that are going to be fired in rapid succession. Think three coyotes in six seconds. Eighth, ninth, tenth shots, we'll now we're obviously shooting colony varmints and again, I want to know what my barrel is going to do on a long string, hot and dirty, no rest.
I guess my real point, is that it shouldn't matter. A good barrel is going to stack three put downrange just as fast as you can get off good shots just as tightly as it will letting the barrel get cold. And, actually, for most of us mere mortals who don't read conditions particularly well, usually the machine gun group will be better.
Just me... But like I said, for me, a barrel that needs to be cooled down between shots to even make a decent three shot group is headed straight for the chit pile. It's a piece of crap barrel and I won't keep it. Life's too short and there are lots of good barrels out there just waiting to be born.
- DAA