My T/C Renegade .50 cal. 1 in 66" twist barrel shoots better than I am capable of using the open sights. The only drawback is that the groups don't tighten up until 100 grs. of Goex ffg. Mine does not have the QLA (which is a PITA when using precut round patches). BTW, the T/C 1 in 66" barrels are deep cut rifling, their 1 in 48" barrels have the shallow rifling.
Larry