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Posted: 7/30/2009 3:47:16 PM EST
Would Twin Cities, 1966 production, 5.56 ammo be GTG or would it be from before the powder was changed ?
Link Posted: 7/30/2009 5:08:27 PM EST
[Last Edit: 7/30/2009 5:12:30 PM EST by Hal143]
Depends on how it's been stored all these years. If it's been high and dry, it should go bang. There's really only one way to find out.

I wouldn't rely on it for duty ammo, but you can always pull a few at random and inspect the powder.
I've fired ammo that was fine after 60 years. It seems it can last indefinitely under the right conditions.

What did the fellas in the ammo forum say?
Link Posted: 7/30/2009 5:19:19 PM EST
[Last Edit: 7/30/2009 5:20:15 PM EST by TexSquirrel]
I think 1966 would be from before the powder change.
I'll double check here in a bit.

Should be fine for target practice...you would just need to clean a little more often if it is a duty rifle.
Link Posted: 7/30/2009 5:30:23 PM EST
[Last Edit: 7/30/2009 5:35:31 PM EST by Hal143]
Probably WC846. This would be Ball powder.
Link Posted: 7/30/2009 6:28:46 PM EST
It's worth more as collector ammo IMO, and is likely the 'problem ammo' they refer to. There is a company on GB that sells collector cartridges - I would sell it to them and buy some ammo you could really use - maybe keep a few rounds for display if you have an early M16 clone. It would likely go bang, but considering the pressures were high on some of that stuff even in 1966, and it may have been stored in SE Asia for some time, I personally would not trust it.
Link Posted: 7/30/2009 6:35:11 PM EST
Yes, 1966 would very likely be WC846 "ball" powder.
Link Posted: 7/30/2009 6:36:45 PM EST
I wouldn't mind a few rounds of it to display next to my XM16E1.
Got a source for it?
Link Posted: 7/31/2009 1:51:23 AM EST
Gunbroker auction # 135214558 . (sorry, can't linky thing) It ends today. 600 rounds in an m-193 can.
Link Posted: 7/31/2009 6:16:19 AM EST
I'd love 20 - 40 rounds of it, but not 600 rounds.
Link Posted: 7/31/2009 5:00:35 PM EST
Link Posted: 8/1/2009 8:30:09 AM EST
Several years ago I had scads of this stuff I think I bought it from Paragon out of shotgun news when they were in business. All in bandoleers on strippers and in the original cans. I shot it all with out a hitch but I also clean my guns after I get back from the range. So it was never a problem for me. Were I going into the bush I probably would prefer to use later ammo just knowing the history of the stuff.
Link Posted: 8/4/2009 6:48:17 PM EST
What kind of powder is used today in M193?

Was the ball powder still used at the time with the addition of a gun cleaning regiment and chrome bores,chambers?
Link Posted: 8/4/2009 6:50:20 PM EST
Yes, the powder wasn't changed until later.
Link Posted: 8/4/2009 7:45:10 PM EST
Bob Hutton developed the .223 round and his early experiments involved IMR-3031 powder. Early military loads used IMR-4475, which is very similar to IMR-3031,
After 1964, ball powders were used, like WC 846.

Standard M193 thru the 70's would be WC 844
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