If I were going to drop the coin on another ABS barrel, I would think twice before chambering it in 300 RUM.
I can say this because I am in that situation and the throat and bore does not look good after 430 rounds. In less than 65 dramatic changes started to happen.
Guys are doing great with the 300 WSM
in ABS barrels. But I would be very skeptical about building a barrel burner on one.
In ABS's AND rock's defense, they have offered to examine the barrel for hardness issues and other defects. If it is problematic, they will replace it. It is in ABS's hands as we speak. I will post the results when I hear from him.
FWIW, when the barrel was fresh it was awesome. So I know they have potential. Velocity was top notch and the accuracy was better than expected, It ballanced nicely as well. The rifle weighed less than 12# with a NF on top. The barrel was also of a larger contour than the Sendero.