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roundball
I got Joe started on using these tubes. The 4 ml size by Becton Dickinson are 13 x 75 mm and easily hold 60 grs. of FFG blackpowder. The larger 13 x 100mm size are about 6 or 7 ml and have BD # 6419 hold about 100 grs.of FFg powder. Hope this helps. All the best...
Gil
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