Re: 223 Reminngton Barrel Life
Not all barrels are created equal, so your mileage will vary greatly depending on: 1) the quality of the barrel you start with (incl. the material the barrel is made of, whether it is chrome-lined, etc.); 2) the ammo you shoot from the rifle (if you are pushing the pressure and velocity limits of the rifle...your barrel will suffer from wear and accuracy loss faster); 3) the kind of shooting you do with the rifle (controlled, single round fire when hunting, slower continuous fire, etc. will let a barrel achieve a longer life while running repeated mag dumps or getting the barrel white hot will kill it quicker).
I have a Krieger 1:7.7 barrel that runs 75gr and 77gr match reloads almost exclusively and it has approx. 6,200 rounds through the barrel and it is still going strong with no signs of reduced accuracy. Again...YMMV.