You are going to have to weigh your bismuth, MEC charge bars are designed for lead and bismuth is lighter. I have found an adjustable charge bar handy for loading bismuth for just this reason. Before I got an adjustable charge bar I had to take a 1 3/8 bar and open it up a little bit with a file to be able to drop a true 1 1/4 ounce of bismuth.
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