Dec 19, 2013 · It's designed by Harrison Beene from AR Performance, the guy that fixed the problems with the 6.8SPC that remington messed up. It's an incredible round for an AR15 size gun. In the fall of 2013 we will introduce the 270AR, a .277 caliber cartridge capable of propelling the wide range of great 130gr 270 bullets to 2800fps out of AR15 20" barrels.

Sep 3, 2008 · 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.

May 8, 2019 · I’m intrigued by the ballistics of the 270 WSM cartridge. Considering an AR build in this caliber. Would love to make this my all-around hunting rifle for coyote, hog, white tail. Anyone with AR experience in this caliber care to share their experience? Thanks in advance!

Jun 9, 2006 · The 270 winchester cartridge is too long for ANY AR-10 based rifles. Those 7mm and 300 mags are remington short action ultra mags which are the same loaded length as a 308. You can build an AR-10 in ANY of the 308 based cartridges, so 243, 260, 7-08 and 308.

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Nov 16, 2014 · The .270 Winchester was originally going to be a 7mm, but in the post-Great War period, manufacturers in the US became averted from using metric dimensions for new calibers in the US market. So the .270 Winchester was chosen, a really odd bore size out of the normal increments compared to popular rifles bores. .257 is the other outlier.

Aug 10, 2020 · So AR guys, I purchased a lot the brass and reloading from a local estate. In the lot was a bag of Lapua brass with a 6.5x47 headstamp. But it is not 6.5x47, I believe they were making 270AR brass. The dimensions are: Case Length- 1.643” Outside Neck diameter- .299” Inside neck diameter- .270”...

May 7, 2009 · The barrel would have to be chambered for .270 winchester. Also the .270 is used in long actions so it could not fit in a .308 magazine or lower. There are not any AR configurations as far as I know of that will accept a .270. Maybe someone has a .270WSM conversion or something but I have never seen one.

Jul 14, 2013 · The 270 AR does make good energy numbers but I assume you posted the HITS up on your chart because it is important. If you notice the Grendel and the 270 go below the 500 HITS mark at the same yardage. So I still fail to see the real advantage. At every 100 yard point they are in the same category.

Dec 2, 2009 · Here is my AR-BMG Innovations .300 WSM upper with a POF lower. The bolt face has to be machined to the larger diameter of the WSM cartridge and the extractor and ejection port need to be modified. Mine runs just as well as my DPMS .308 if not better.