Most common caliber

So I read a good article some time ago, I tried to find it for reference to back up these facts.

It was based on the great 8, that being 8 criteria for making or being a great shooting rifle cartridge. I can't remember them all but I'll try my best. These are not in any order

1. ft. lbs of recoil this had a number
2. ft. lbs of energy delivered out to 300 yards
3. price
4. availability in the world
Help me out here guys I can't remember the other 4, in any case the only 3 too make the great 8 was .308, 270, and 30-06.
Thats the best I got, wish I could find the article
 
So as a beginner in long range hunting and a small time preppier kind of guy, what do you think the most common caliber in North America is? I know the 223/5.56 is the absolute most popular, but I think either a 300 win mag, or 30-06 Springfield would have to come in close seconds.
6.5 Creedmoor is the most popular rifle cartridge based on sales. Every rifle company now offers a 6.5 Creedmoor.

But overall .22LR is the most widely popular round
 
I suspect that 30 caliber is still by far the most popular or common. That encompasses .30-'06; .303 British; .30-30; .308 Win; .300 H&H; .300 Win Mag; .300 Weatherby and a whole slew of Wildcats and other commercial cartilages that elude my brain right now. My 2¢ worth
 
WWI and WWII made the 30-06 the king. NATO (to save weight) made the 308/7.62 the new king. The 30 caliber is the universal standard as the 22LR is for the rimfire world. Many wildcats have evolved from the 30-06 and 308 cases some of those have been made commercial. Lots of 223 shooting going on at the range and for trash animals but if it is for hunting or fighting, the 30 caliber is king in my view. Handloading adds much to the mix but lots of ammo is sold 20 to the box for hunting. If I could have only one rifle, it would be a 30-06: kill anything on earth, reasonable recoil and ammo available everywhere; if you handload there is a huge selection of bullets available.
 
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