I am thinking about ordering a barrel from X-caliber in .284 Win, just have a few questions that maybe someone could answer.

First, does anyone know what 284 chamber x-caliber uses? Im wanting to run a COAL of 2.950 with the 162gr ELD-X and im concerned that a SAMMI spec chamber will be a bit short, while a match chamber for Bergers will be on the long side.

Second, im up in the air on twist rate. Xcal offers 1:8 - 5r, 1:8 - 6 groove, 1:8.5 - 3 groove, 1:9 - 6 groove, and 1:10 - 6 groove. Hornady specifies 9.5 minimum. I have heard good things about the 5r rifling, but will 1:8 be too quick?

If anyone has some wisdom to impart on me it would be greatly appreciated.