Most UNDERRATED Cartridge???

[thinkingman]

.243 and 7-08 are maybe underrated due to the casing having lower capacity.
I think the .308Win casing is the basis for some of the most accurate and efficient cartridges in the world.

[MountainWalk]

 I think the 220 Swift, 264 win mag, 7 mauser and 35 whelen are all underrated rounds.

[JackOfAllTrades]

I voted .243. Punching to .243 Ackley Improved is sweet and totally under estimated. In the hands of a good shooter even the factory .243 is a very versital round. From little varmints out to 400yds to Deer sized game at less than 200yds with the correct bullet choice.

-Steve

[6x6in6]

.280
With the .270 and 30-06 on either side of it in popularity and versatility, it fits the underrated bill.

[finnman]

7-mm 08 

[Huntbear]

I voted for the 7mm-08 but I believe the .257 Roberts and the .300 Savage probably has taken more game than you can imagine.

[JoshT]

.300 Savage... good call, forgot that one.

I left the .358 off my list too... and the 6.5 Swede (though the .260 is about the same)... the 7x57 (same as the 7/08)... and I think the .338 Federal is a little underrated too. Seems a new cartridge needs to put up the big numbers in the velocity department... even if it kills all manner of critters deader than yesterday's turkey sandwich.

[Intruder]

260