Throat erosion

[eric n]

How much can you expect the throat to erode after 5-6k?
My groups have opened up the last few hundred rounds so I decided to measure the distance to the lands again. They moved .127. Is that normal?... I guess my bigger question is how can it keep shooting well through a jump transition that long? I started shooting it at .005 jam and here I am. It shot consistent .5 and has opened up to 7s and 8s the last few hundred rounds. The bullet most used is 69 smk with varget.
I cant believe how much time I wasted tweaking my seater each bullet to get exact oal, lol.
Gun in question is a factory savage vlp.

 

[Hotshot]

Some barrels seem to shoot very well as the throat wears and some just go bad.
It might be time for you to set back and re-chamber that one.

 

[TAJ45]

If you're twisted OK, maybe do some load dev. with a longer/heavier bullet and see if you can regain what you've lost. If not, set back time.

 

[eric n]

Thanks for the replies.
In retrospect, I should have seen the small shifts in poi, and fliers that weren't too far outside the norm but were there none the less. I always attributed it to me, as this was the gun I learned to shoot and reload with. I cant believe I never checked throat wear.
I figured .5 moa was great until I had a gun built and realized I can outshoot the savages capability now. I guess I will turn it into a 6br now.