Hope this is in the right section. If not perhaps a mod can move it.
I was just idly thinking as we were waiting for a position on the stand at the range the other day, about "magic cartridges" the ones that work so well. There are some out there that just seem to have everything come together so it works better than the ones nearby. The ones I could think of were all fairly old but that might be a qualifying factor as they need to be tested over a good few years to see if the magic is really there or is it just the newest kid on the block. So to kick off here are a few I thought of at the time, please feel free to add to the list or slag off my choice. All my choices are soft shooting in their category as well.
.222 Rem. Flat enough very accurate and doesn't seem overly fussy about the ammunition.
.30 - 06 Does most things very well, not overly fussy and a terrific range of bullet size.
7 x 64 Better than a 270 because of the bullet weight choice and seems to buck the wind well.