tag:blogger.com,1999:blog-8515829.post1223196980141052211..comments2024-03-19T04:53:45.851-07:00Comments on Irons in the Fire: Pressure curves and moment; updatedFirehandhttp://www.blogger.com/profile/04562365951182027709noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-8515829.post-27024796737936718192009-01-30T21:39:00.000-08:002009-01-30T21:39:00.000-08:00IIRC, the original powder specified for the M-16 w...IIRC, the original powder specified for the M-16 was an "IMR" (stick) type. A ball powder was substituted for some reason. The problem was that as long as the ballistics requirements were met, the specification for the powder didn't put any limit on the content of calcium carbonate. (Calcium carbonate is used as an antiacid.) As a result, the maker used a lot of the stuff. This resulted in a calcium based fouling in the gas system which was extremely hard to remove. This and the early report that the M-16 never needed cleaning had predictable results.Anonymousnoreply@blogger.com