Standard Colt barrels, such as the HBAR, can be quite accurate. With a good trigger, good ammo and a good shooter, the accuracy of the HBAR may surprise you. I have found that the 7 twist HBAR's really shoot well with the 68, 69, 75 and 77 grain ammo. Good handloads really help.
Good optics are also helpful but the optics will not replace good ammo. For instance, if you were to install a $1,000 scope and such 10 cent per round 55 grain ball surplus ammo your accuracy will probably not be very good. If you were to install a $200 scope and shoot premium Black Hills 68, 69, 75 or 77 grain ammo your accuracy will definitely be much better.
I always suggest that my clients try an upgrade to their stock triggers first, That upgrade can be surprisingly good and will often meet the needs of the average shooter striving for better accuracy.
E-mail with any questions. Take care. Charles.