ORIGINAL: stubblejumper
Sorry, I disagree. Jacketed bullets DO wear a barrel, especially at high velocities. 220 Swifts and 223 WSSM are known for eating barrels
The barrels don't wear out due to friction.The throats burn out due to pressure and heat.
Large-cased overbore cartridges that burn huge quantities of powder to achieve their velocities are going to wear throats faster than smaller-cased cartridges of the same caliber. The 7mm Ultra Mag, 7mm STW and 7.21 Fireball are a good deal faster than the 7mm Rem. Mag., but they burn a whole lot more powder to get there.
Overall barrel wear will be faster, and they will erode throats much faster.