There are a few rare people, especially some who live at higher altitudes who know what they are doing and get along with 77 quite well; then there are those who just don't know much like once a year hunters and beginners who either struggle with it or shoot with the bullet or sabot bullet combination seated on the crudring and not the powder and never realize it unless they ruin a barrel. I would not know but suspect that even if you don't hurt the barrel it going to make a major difference in accuracy.
I suggest that anyone who uses 77 use a witness mark and refer to it very carefully even if they think they have taken the crudring out.