Accuracy is the measure.

If you want more velocity, try a different load.

If you just want a new barrel, get one - lots of good ones are made every day.

Every barrel I have shot out has had 2 things happen, as well as other shooters I have talked to-

1- accuracy begins to or fads away. Groups open up. You will also see fliers happen. When my 300 WM went south, I was shooting a 700 yard target, and I missed by about 8 feet. The next few rounds were near the target, but you get unexplained fliers.

2- Your speed decreases. I was on the same powder lot for my 260 Rem, and that load ran 2800+ fps. It began to drop into the 2730's with the same loads and powder lot. I ran a bore scope through it, and the fire cracking was about 8" from the chamber. The first 3" was severe, and had chunks of barrel missing in many areas. Groups opened up with fliers, also. It had 2600 rounds on it, then set the barrel back by 3", and kept it 260 Rem. The accuracy improved, but it only lasted about 400-500 more rounds. And the accuracy was never as good as a new barrel. It would shoot a clover leaf group at 100 yards, where it used to shoot same hole. I will never set a barrel back again.

Shooting 1 moa can still be possible on a shot out barrel. But you will get fliers mixed in. If you run a bore scope down it, you can see if you have severe fire cracking. Fire cracking is 100% normal. It's the severe cracking with chunks of barrel missing, that will clue you in to the condition.

What powder charge are you running, what bullet, and barrel length?

In the mid-80's I picked up a 700 BDL in 25-06 from a pawn shop for under $200. No idea of the round count. Since then, I have put more than 2000 rounds down the barrel. . . .

In playing with some new powder (RL 26), I, once again, found a load that prints 5 inside of 1" at 100. . . .

I have always heard that a barrel was 'shot out' when accuracy diminishes but mine never has. . . .