Throat erosion FTR rifles

[Belly Benchrester]

Not sure if anyone has the same thing going on as me . I have 1,000 rounds through my FTR rifle shooting 44 grains of N140 with a 200.20x approximately 2610 FPS . To seat my bullets 8 thou off the lands my oal has only changed one thou from when I first started shooting it

 

[XTR]

It's a 308, that's not surprising. Mine don't seem to move much either. When you get to about 3000 rounds on it it may start moving faster, but till then you're doing fine.

 

[Zero333]

Me too.. I don't see much movement in AOL in many of my barrels throughout their lifespan. I don't treat the barrels good. Rarely clean them and let them get scorching hot all the time except in the deep freeze of winter when barrel heat is no problem.

 

[dcali]

In my experience, it seems like accuracy drops off from F Class levels before you see a ton of movement in a .308. It's one of the nice things about a big bore. Millage may vary (significantly).

 

[memilanuk]

I've had a couple barrels that appeared to move an appreciable amount (5-8 thou) during the first ~400-500 rds, whether due to the lands getting smoothed down and/or a burr getting worn off, I don't know. The first time, it scared the crap out of me and I started cleaning the barrel down to bare metal and checking the throat after every single day. It moved *maybe* 1 thou over the next 1800+ rds.