IMR 8208 works just fine in my Cooper M16, 6BR.

Born in Illinois (Da Bears). Living in Maine. IR 50/50 Rimfire Bench Rest Shooter. Retired Army NCO. 6BR hand loader, as my user name implies, I have participated in all 3 East Coast Cooper Firearms of Montana One Shot Competitions. One of the cherished paintings found a home this year. Model 21 Coo...