I knew why you wanted the flutes Boss!
Recurring theme I see is that you should wait 1-3, 5-10, 20-30 minutes between shots when group shooting. This is the craziest thing I have ever heard. Heres the deal, If you are going to wait a few minutes between shots, then why do you have a magazine in your rifle. You would have no idea where your follow up would land anyway if you needed it. There is a load that will shoot consistently in your rifle. That load may not shoot 1/2 inch groups, but if you get 1moa and it is predictable that is better than a 3 inch gun that will put them all in one hole if you wait 15-30 minutes. most guns will shoot wonderful groups if you cool completely between shots. But there are a ton of factory rifles that will go Bang bang Bang, and put them all in one hole, hell I got apost 64 100 winchester that will do it with several loads and bullets. Did it yesterday with the cheapest factory ammo I had in the house. In fact, I have four that get better when they heat up. A Remington 700 stainless .300 win mag, Steyr Stainless SBS Pro Hunter Mountain with a very thin barrel, that old winchester 100 .308, and my Savage LRH. I never wait when shooting groups. I have only once needed a follow up and that was with a single shot 45/70 encore. I killed the deer on the fourth, the scope was broken. But, it is no test of potential if you wait that long, it is not a real world situation,and therefore tell you absolutely nothing, except to maybe make you think you have loaded wonderful ammo that will fail you the first time you need more than one. For a bunch of long range shooters, this thread shocks me. Or is the general consensus that you cant shoot good with factory barrels. I see the quality in custom, but there are a ton of factory rifles from $300.00 up that will place the right loads in 1/2 inch at 100 yards or 3/4 at 200. they don't feel as good, nor look as good, but they shoot very well. Another that I know of will put three consecutive in a half inch is my fathers 25-06 Marlin XL7 with his 70.00 center point scope.
Bottom line is with a hunting rifle especially, you want to know what your follow up shots are going to do, this is the whole point behind shooting groups in the first place. A group with a completely cold barrel only tells you how close your first shot will be to your zero at any given time, also valuable info, but that is better checked on various days and weather situations than 30 minutes apart. that will only tell you what your first shot will do today, what if its 80 and sun shining today, you sight your rifle in and it looks good. You hunt in a week and the temp is 55 and drizzling rain? You now have no idea where your first bullet will land.