Had Jim do a 7 twist 243Win on an X-Caliber Blank for me. I shot a 5 shot group at 415yds that measures 1.438". Weather was 33 degrees, snowing, with a 2-3mph wind. I was shooting off a Bipod and rear bag. I've only cleaned it with a bore snake and some Hoppes #9 2 times in about 450-500 rounds. My data has been pretty much the same from that 33* weather to the 80-90* weather we have now in SOCAL.

I'm very happy with this barrel!