as the title says: just bought the last bottle of IMR 4198 at a local store. i have i and a half CANS of the same . probably about 30 years old. my question is . can i mix all of it together without any ill effects? it will be used in low doses for cast bullets. and then it will all be the same mix. many years ago i mixed ball-c and ball-c2 together. probably wasn't smart, but i started with a lower dose and worked up. everything was ok.