I use D97 8 stran with the loops padded to 20 with B 50 on all my bows self bows and vintage bear bows the oldest being a 1962 Kodiak , I think there is a night and day difference , the only down side it takes me longer to pad the loops out , but well worth the added the time , and as far as the cost you use less strans to make a string 8 strans for a 50# bow , on my third roll of D97 , one roll makes many strings. With all the better string materials out on the market now , you can take an ok bow and make it shoot better. Curt