I use Win Blue bag with great success, no experience with the red bag stuff. Shot lots of Rem brass in the 6 AI, 70g, AA2700, 14T, 26", 4100 fps, tiny groups. 10T Douglas dropped the formed brass load to 3980 fps, with great accuracy, same AI reamer used for both cases.
Many years I hunted coyotes with 6 Rem customs, 12T .030 freebore
60g Sierra with 50g of win 760, 210 primer, rem case, 4000 fps, 3/8" and below groups
80g Sierra Single shot pistol bullet, 80g Sierra blitz BT, 80g Berger with 42.0g of IMR 4064, Fed 210
3500 fps, 3/8" groups,12T 26" barrels. I quit using the bergers because they did not blow the coyotes up enough....I like BIG holes!