# Bought a Ruger SR-556

**URL:** https://forums.speedlife.net/t/bought-a-ruger-sr-556/265753
**Category:** Shift518 Off Topic
**Created:** [December 14, 2012, 7:45pm UTC](https://forums.speedlife.net/t/bought-a-ruger-sr-556/265753 "2012-12-14T19:45:28Z")
**Posts on this page:** 1
**Showing post:** 31

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### Author: ![pitman](https://avatars.discourse-cdn.com/v4/letter/p/4da419/32.png) [@pitman](https://forums.speedlife.net/u/pitman)
#### Post date: [December 18, 2012, 9:32am UTC](https://forums.speedlife.net/t/bought-a-ruger-sr-556/265753/31 "2012-12-18T09:32:52Z")

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> [@FS: Garage SaLe!! Everything CheAp!! Hockey, Car, Video Stuff](https://forums.speedlife.net/t/fs-garage-sale-everything-cheap-hockey-car-video-stuff/51290/3):
>
> .270, hands down. They both shoot the same caliber bullet, but the case of the .270 is bigger, hence why the velocity is much higher (3060fps .270 vs. 2500fps 6.8). Also, given that energy will be greater as velocity of the same mass increase, the .270 has 2702ftlbs at the muzzle, where the 6.8 has a mediocre 1759ftlbs. These figures are from a 130gr .270 round, and a 115gr 6.8 round out of a 24" barrel, so if they were the same exact weight there’d be an even bigger difference in velocity, but slightly less difference in energy.
> 
> 6.8 is often referred to as the “.270-Lite”.

i might consider a 270 ar. i have so much reloading stuff for a 270.

thanks for the info too.

whats your take on barrel length? 16" vs 20" vs 24"

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