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thallub · February 11, 2014, 11:21 PM

The powder used in early M193 5.56mm ammo is IMR 4475. The US Army made the change to WC846. WC846 gave the M16 rifle a bad reputation. It increased the cyclic rate of the M16 rifle by 200 rounds per minute.

The M193 round was accepted into the US military inventory with IMR 4475 powder. Then the change was made to WC846, then to IMR 8208.

i sometimes use WC846 for my .223/5.56mm reloads: Mostly because i bought it cheap years ago. Got to be careful with WC846 maximum loads in hot weather. i have some reloads marked for winter use only.

Slightly off topic.
The Ichord committee report on the M16 rifle and it's ammo problems:

http://www.bobcat.ws/rifle.shtml

February 11, 2014, 11:21 PM	#40
thallub Senior Member Join Date: November 20, 2007 Location: South Western OK Posts: 3,112	The powder used in early M193 5.56mm ammo is IMR 4475. The US Army made the change to WC846. WC846 gave the M16 rifle a bad reputation. It increased the cyclic rate of the M16 rifle by 200 rounds per minute. The M193 round was accepted into the US military inventory with IMR 4475 powder. Then the change was made to WC846, then to IMR 8208. i sometimes use WC846 for my .223/5.56mm reloads: Mostly because i bought it cheap years ago. Got to be careful with WC846 maximum loads in hot weather. i have some reloads marked for winter use only. Slightly off topic. The Ichord committee report on the M16 rifle and it's ammo problems: http://www.bobcat.ws/rifle.shtml