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Old September 10, 2020, 11:28 AM   #39
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 16,673
Cordite MD, as used since 1902, is approximately 65% guncotton (nitrocellulose), 30% nitroglycerine, 5% petroleum jelly (Vaseline.). (Another source gives it as 58-37-5). That is about as "nitro" as it gets.
Straight nitrocellulose powders are not "rougher on the rifle" and are actually less erosive to the bore. There were regulations about avoiding interchange of Mk VII and Mk VIIIz ammo because different wear characteristics could lead to bullet key holing and erratic flight, dangerous in overhead fire.
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