I have recently renewed my personal relationship with .308 Winchester, the consumer version of 7.62×51, the last big bore calibre developed for military use (1950s) and the last retired from general use (1960s). I notices a few FALs in use in Libya. These days, no one takes seriously lugging around a 10 lb rifle and a few hundred rounds of .30 calibre ammunition. Everyone who can uses artillery, rockets and air-power for the long-range or tough targets and uses something like 5.56×45. It’s just more efficient to issue lighter rifles and ammunition that any adult can operate with proficiency than the heavier equipment. It is less important that 7.62×51 can deliver the same energy to 900M that the 5.56×45 can deliver to 600M if soldiers are short of ammo or fatigued by lugging it around.
The same is true of PCs. As CPUs become more powerful, networks become faster and RAM becomes faster and cheaper the price/performance of PCs constantly improves. Going to ARM and Linux allows a quantum leap in battery life/energy efficiency and portability. That is why Wintel will be replaced by Linux on ARM. Those who deny this are repeating history. The same sorts of comments that were made disparaging the 5.56×45 rifles and ammunition as toys are now being made about small cheap computers. The truth is that most tasks that the vast majority of us need to do using a personal computer can be done with a smart phone or tablet. If you don’t need to type a lot, you just don’t need the keyboard and you gain a huge amount of other benefits: cost, portability, energy efficiency, and mass of recycled/wasted materials. If you do need to type, you can connect a keyboard to many small cheap computers via USB.
The throughput of small cheap computers built on ARM reached 1080P video years ago but if there are more compute-intensive jobs required, they can be done on servers. That’s no different than the typical PC which uses servers for many tasks: database, web applications, super-computing…
That said, I would use a .308 Winchester for hunting deer because it hits harder than 5.56×45 and the small centre-fires used to be illegal for deer because most bullets were designed for military use or gophers and not deer but that has changed: Manitoba Hunting Guide – Pellet Guns and Rimfire Rifles
A pellet gun or rimfire rifle (e.g., .17 or .22 calibre) may not be used to hunt big game.
A centrefire rifle may be used to hunt big game only during general rifle seasons. A centrefire rifle of .23 calibre or less is not recommended.
With a heavy .224 bullet with a tougher core, a 5.56×45 or even .222 Rem could be used to hunt deer in open terrain. Better accuracy and flatter trajectory are beneficial. An expanding .30 calibre bullet anywhere through the rib-cage will do the job better.
Still there are lots of people who don’t hunt big game who could use a rifle of the smaller calibre very effectively: target shooters, trappers/hunters of fur-bearers, and varmint hunters. What’s more, the recoil and weight of the light rifles is preferred by children, and most women. They can shoot more and become more proficient without bruising. Similarly most people welcome Android/Linux on their smart phones and they will on all personal computers sooner or later. It’s a matter of what works for them best. The small cheap computers are certainly better for many emerging economies where many can afford a small cheap computer and not a tank/ATX PC/notebook.