Any reason 223, 55 grain would cause jamming in AR 15's?

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Moparfreak

Bearcat
Joined
Jul 21, 2022
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Location
La Follette, TN
I have a friend that claims 223, 55 grain causes jams in Ar 15's while the 62 grain round does not. I'm new to this style of rifle so i don't know. I would assume that with all the 55 grain ammo sold, that jamming wouldn't be an issue. Thanks for the replies.
 
Joined
Mar 24, 2002
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5,527
Location
Oregon City, Oregon
I don't agree at all that 55 grain loads cause malfunctions.

I would entertain the discussion however, if an old worn our M16 barely operated, (like the issued M-16's of my day), a heavier load and/or heavier bullet could improve operation.
 

the_leper_colony

Single-Sixer
Joined
Mar 5, 2015
Messages
289
I have a friend that claims 223, 55 grain causes jams in Ar 15's while the 62 grain round does not...

A lot of gun owners offer blanket opinions, based only on personal experience. (For example, "If it ain't a 1911, it ain't worth sh!t!") Your friend may have had experience with a specific AR15 (one out of a million variations), that had issues with a specific 55 grain load (reloads? steel case?), but no issues with a specific 62 grain load (match ammo? who knows?). Result: advice to friends to 'avoid 55 grain like the plague because it causes jams!' A lot of individual firearms may actually perform better with one type of ammo than another, but even an apparently identical firearm from the same manufacturer may have different 'preferences'.

IMHO, FWIW, YMMV, etc., etc.
 

Jeepnik

Hawkeye
Joined
Dec 16, 2005
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5,703
Location
On the beach and in the hills
Guns are individuals. Some may not like a specific ammo. But to say all AR’s jam on a specific bullet weight is overreaching.

The one thing that can be said is that the M-16 is the worst firearm forced on American service personnel ever.

On the other hand the 1911A1 is the best handgun ever supplied to them.

Both of the above are from personal experience. Proof of those statements occurred in less time than seems humanly possible.
 

Mobuck

Hawkeye
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Dec 25, 2007
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7,586
Location
missouri
Before I can comment, I need to know what 'jamming' means. As with any mechanical device with moving parts, there can be any number of causes for malfunction.
I custom assemble AR platform firearms and don't accept 'jams' being common for a specific bullet weight--simply too many other possibilities.
 

arcticruger

Red Eagle
Joined
Nov 30, 2008
Messages
477
Location
Northland
My SP1 and my stock Colt A1 uppers (and slabsides) use the 55gr bullets, and eats them like candy. I always try to use Winchester Q3131 and Federal M193, hot and reliable. I use it in my faster rate barrels at sometimes as well. I never have problems with the ammo itself.

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the_leper_colony

Single-Sixer
Joined
Mar 5, 2015
Messages
289
Never had my life depend on a Chauchat.

That will definitely give you a different point of view. I remember reading that the GI rifle lubes issued during the Korean War could solidify during freezing weather, and some American troops reportedly used pencil lead (graphite) instead, to keep their M1 rifles & carbines running.
 

JOHNNY WACKO

Blackhawk
Joined
Dec 23, 2006
Messages
532
must be a bad rifle when i build them they shoot anything brass steel case any weight or there junk
 

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NC FNS

Bearcat
Joined
Dec 25, 2015
Messages
54
Location
Western NC
Is it steel case ammo? Only problem I ever had was failure to extract some steel case (after shooting 60 or so rounds of brass case first).
 
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