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Old 01-25-2013, 01:38 AM   #31
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Originally Posted by rocshaman View Post
I was always told that my Colt SP1 would shoot 5.56 but I've never trusted that and always shoot .223 through the rifle. It has .223 Rem stamped on the side of it and that's what I use.
the sp1 is 223 not 556.

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What's really the difference between .223 and 5.56?
the difference is that the 223 has a shorter lead area in the throat than the 556. so when you load up a military 556 round its possible for the bullet to hit the lands and that creates an overpressure situation which can lead to a kaboom. this overlong situation is normally found in tracer and some ap rounds including the ss109 bullet.

if you are loading for a 223 using 223 data but are using military pulls you will still run into trouble. to know whether a given 556 is safe in your 223 you need to know the overall length from the bullet ogive and the overall lead EXACTLY in your individual rifle barrel then load under that length. this can also cause overpressure due to shorter length.

its dangerous to use military bullets in a 223 no matter how its stacked up.

anywayyyyyyyy its best to just stay away from military surplus and 556 in a 223 unless you really know the ins and outs of what ive glossed over above.
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Old 01-25-2013, 01:44 AM   #32
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Thanks Jon, I'll stick with the .223. Now if I could only find some for sale....

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Old 01-25-2013, 01:46 AM   #33
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I'm a Rock River Arms supporter love mine very accurate no problems and I'm starting to like heavy barrels more accurate but a little heavier so if ur going to be walking ditches when u hunt it'll wear u out after while oh and get it in .308 great all around hunting round and plentiful ammo, except right now in the crazyness that guns and ammo are going through

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Old 01-25-2013, 01:48 AM   #34
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loading your own really opens your choices a LOT when it comes to 223. there are far far far more bullets available than the junk that gets sold in factory boxes.

if your sp1 is a 1-12 twist like mine it will really really like some of the lighter varmint bullets in the 50-52 grain range

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Old 01-25-2013, 01:51 AM   #35
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Yes it is a 1-12 twist, but as of yet I haven't started reloading. I want to start soon though.

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Old 01-25-2013, 02:30 AM   #36
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Quote:
Originally Posted by JonM

the sp1 is 223 not 556.

the difference is that the 223 has a shorter lead area in the throat than the 556. so when you load up a military 556 round its possible for the bullet to hit the lands and that creates an overpressure situation which can lead to a kaboom. this overlong situation is normally found in tracer and some ap rounds including the ss109 bullet.

if you are loading for a 223 using 223 data but are using military pulls you will still run into trouble. to know whether a given 556 is safe in your 223 you need to know the overall length from the bullet ogive and the overall lead EXACTLY in your individual rifle barrel then load under that length. this can also cause overpressure due to shorter length.

its dangerous to use military bullets in a 223 no matter how its stacked up.

anywayyyyyyyy its best to just stay away from military surplus and 556 in a 223 unless you really know the ins and outs of what ive glossed over above.
But .223 is okay to use in a 5.56, so as long as you have a 5.56 barrel your fine?
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Old 01-25-2013, 02:33 AM   #37
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Wait it out, and buy a daniel defense.or you could just get your hands on a stripped lower and atleast 2 magazines, and just wait till the dust settles to build the rest

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Old 01-25-2013, 12:33 PM   #38
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Quote:
Originally Posted by FullautoUSA

But .223 is okay to use in a 5.56, so as long as you have a 5.56 barrel your fine?
I don't thank you can just put a 5.56 barrel on a .223. But if your gun said 5.56 on it when you bought it. Then yes you can use both.
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Old 01-25-2013, 12:45 PM   #39
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I don't thank you can just put a 5.56 barrel on a .223. But if your gun said 5.56 on it when you bought it. Then yes you can use both.
The AR platform is all about the barrel. You can put a 5.56 barrel on it, if you can find one.
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Old 01-25-2013, 07:03 PM   #40
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Quote:
Originally Posted by mountainman13

The AR platform is all about the barrel. You can put a 5.56 barrel on it, if you can find one.
Cant find anything now, hopefully it will die down
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