Some well founded info on obtaining good accuracy here. Others include the quality of the barrel, how it's installed and chambered,the scope mounts, trigger quality, precision of the bullet, how the load is tuned to the rifle, etc. In other words, it's a system in which all components add to the total, nothing stands alone but any one can spoil the results. I've been loading for more than 40 years but I'm no "expert", not in the same league as those who work for Handloader at all. But even experts sometimes say something foolish.
They said: "...certain cartridges need nothing other than standard loading as they are inherently accurate."
Bah. Such bland statements, taken alone, are worthless. Of all the factors involved in accuracy, the case is perhaps the least important, IMHO. Yes, shorter cartridges have a slight advantage, if we can realize it, but many other factors over shadow the tiny advantages of case shape by a wide margin. It appears they failed to mention any choices that are "inherently accurate", wonder why? And, if that's true, there must be some cartridges that are "inherently inaccurate". Wish they would tell us which ones are which!
In top level Bench shooting events, the top cartridge is the short, fat 6 mm PPC. Yeah, it's king because of it's inherent accuracy. BUT those BR guys have extremely high-quality equipment that allows for its small advantage to be visible, including the use of 24 to 36x scopes and $300 rests. Without that, they would never see the 0.020" or so it is better than several other BR rounds. The rest of us simply don't have that quality in our deer and varmint rifles so comments about inherent accuracy dangle invalid hopes before us, "If I only had a ...., I could shoot great groups." Maybe but not likely, and then not because of a magic cartridge.
Believe me, if there were any STATISTICALLY VALID hunting cartridge accuracy differences when fired from factory rifles, the magazine writers would tell us and have the data to prove it! I doubt there is more than a quarter minute difference between the absolute best and worst hunting cartridges, as such, and that's no difference at all in the field. Those of us shooting factory rifles with off-the-shelf hunting bullets will realize NO differences in accuracy directly attributable to the shape of the case!
A few cartridges do seem to be easier to develop a good load for, but similar accuracy can be attained with most cartridges if we work to find its "inherently" accurate load. I believe a carefully constructed .30-30 cartridge with a good bullet will shoot out of a bolt rifle with a properly fitted, high quality barrel as well as any other hunting round fired from a similar quality rifle.