Duq.edu
Sub-sonic 5.56 NATO and 7.62 NATO rounds were costly in those days (i.e. circa 1967-70) @ approximately 32ยข/round: cases were partially filled w/epoxy to take up space; early examples had Cream of Wheat (the cereal), cotton, nitrated paper mixed w/cotton. These early fillers performed badly and the overall ballistic performance (i.e. accuracy) was deemed poor until an epoxy filler was adopted ... ................
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