Range Report - Liberty Barrel with Scraped Throat

[BjornF16]

Based on this, I would consider another source for reaming the throat if I had one of these. Before this, most of these barrels have shot really well, because there was no jump at all, but pressures were a problem in many, because of seating depth limitations outside of spec.

What if you could ream it, say with a crazy idea of a chamber that had some shallow leade, then a 1.5 degree leade? It would be the best of both worlds, right?
Call it a 6.5 Grendel or something. This is exactly the testing process that AA went through when developing the cartridge. For example, just in the last few weeks, we have seen .264 LBC chambers that shoot 123gr SMK, Scenar, and A-MAX amazingly (all sub-MOA 5rd groups), then 120gr NBT shoots 2".

We have seen short-throated guns shoot amazingly well, but seating depth is too short. We have now seen one of these barrels with the throat generously "scraped", and initial accuracy results seem to have opened a bit, although position and conditions may have been a factor.

Lower pressure cartridges don't do well with jump. They do great with shallow leade transition, which still leaves plenty of room for variances in projectile shape, without losing accuracy.

See http://www.65grendel.com/forum/showthrea...#post89015