Mine is called a 6XC....built one 6-7 yrs ago
used 22/250 brass necked down & formed to XC
now dies & brass are easy....mine is a heavy 27" w/8 twist
As mentioned..the 6BR is really tuff to beat....have a heavy
one of those too...12 twist for 70-75 gr boolits
the 6XC has confirmed p/dog kills out to 1100 yds...