Most underrated cartridge I would say 7-08. My first hunting rifle, given to me at age 12-13 by my parents, was a model Seven with the Schnabel tip wood stock and 18 1/2" barrel in 7-08. I'm 46 now and still find it one of the most useful calibers ever. I have killed plenty of deer & hogs with it. I used Remington 140 gr factory ammo before I started rolling my own. Now I use 120 gr T-TSX over Rel-15.
