Discussion in 'AR Talk' started by Reload 02, Sep 3, 2008.
Does an ar15 .270 conversion upper exist? If not what about .243?
I've seen a .243 WSSM.
.270 is based on .30-06 case. Will not fit standard AR15 or AR10 receivers. IIRC Cobb rifles makes a semi auto AR like rifle in .30-06, they may make .270 as well.
.243 is based on .308 case. It will not fit in standard AR15 action. It will fit in AR10 action and a couple of companies make .243 AR10's.
If you want a .270 caliber in the AR15 look for a 6.8 SPC. It's a fairly new round made for the spec ops guys that wanted something bigger than 5.56/.223. Remington makes ammo for it and many people are making AR's or upper kits for it.
According to Modern Reloading Second Edition by Richard Lee the Overall Lengths are as follows:
.223 Rem is 2.26” long (pg 222 )
.308 Win is 2.81” long (pg 424)
.270 Win is 3.34” long (pg 331)
And by way of comparison the 30-06 Spr is 3.34” long (pg 444)
My point is that a .270 Win will not even fit in a .308 chambered AR or the magazines, it is .53” longer than the .308. If you do some hunting I am sure you will find someone making an AR platform long enough to handle the .270 but I am guessing you will pay out the … for it and I am not talking about your nose.
Good luck and happy hunting.
6.8mm SPC is .270 caliber.
However, it's not the same as the classic .270 Winchester round.
You could, however, get a .243 WSSM upper for an AR-15...but not a .243 Winchester (as mentioned above, you would need to go to an AR-10 platform for that).
I don't "need" a .270. I am new to ARs and had heard there a lot of conversions and was curious. I love my new AR but I really like my 270 and was wondering ably it. What is the effective range on 223? And how is the drop past 100 yards? I just got me Stag 15.
DPMS: AR-15 Rifles, Parts and Accessories.
Looks like DPMS has a couple AR's in .243, no .270 though.
Here you go.
Remington.com - Products - Ammunition - Ballistics
.223 -2.3" / .243 -1.6" / .270 - 1.8"
.223 -12.9" / .243 -8.8" / .270 -9.8"
There's lots of other calibers and numbers here as well as free ballistics software.
NRA and CMP competitions are regularly won at ranges out to 1k yards with the .223 round. If you want to punch paper the .223 is effective out past 1k yards, putting game (or a person) down with a .223 varies depending on a whole lot of factors such as bullet weight or your intended target. Effective range has many variables andif you ask 10 shooters what constitutes effective range you will get 10 different answers. The easy one is paper punching and you can do it all day long with the right upper assembly.
I've been doing some research on my own first build and came across this
Olympic Arms, Inc. - AR-15 Conversion Units
and this page has some interesting info for debate/thought.
.243 WSSM The Long-Awaited 6mm "Answer"?
Hope they help.
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