The Firing Line Forums

Go Back   The Firing Line Forums > The Hide > The Art of the Rifle: Semi-automatics

Thread Tools Search this Thread
Old November 28, 2012, 01:23 AM   #1
Senior Member
Join Date: October 13, 2001
Posts: 241
+P handloads in piston-driven AR's?

As more and more piston-driven AR's now have the ability to adjust the amount of gas diverted away from the bolt carrier . . . . it makes me wonder . . . . is there the potential to develope some hotter, +P handloads, for use in these rifles? Especially, in the larger cartridge versions: 6.8 SPC, .30 Rem AR, etc?

Thanx, Dave.

PS - Perhaps, some FAL shooters can contribute to this discussion, since they've been able to adjust their gas (bypass) systems for awhile.
Watch your top-knot.
BluRidgDav is offline  
Old November 28, 2012, 06:53 AM   #2
Senior Member
Join Date: February 19, 2012
Location: A wheat field in Kansas
Posts: 141
The problem wouldn't be the gas system and a piston system wouldn't be tougher than a D.I. system since adjustable gas blocks have been around longer than adjustable piston systems but people have steered clear of over charged loads.
The area of concern is the chamber and locking lugs. The ar15 is designed for a 5.56x45 and putting a 6.8 bbl greatly thins the chamber walls, think of taking a lightweight 223 bolt action and reaming it out to 6.8 spc and then adding pressure over that (since +p is plus pressure and not always a worthy velocity gain). I'm not saying that there's anything wrong with the great 6.8 but it's good to keep a caliber for what it is, if you want a more powerfull caliber than 6.8 it would be safer to get an ar-10 platform in 308, 7mm/08 or 243 than risk blowing up a good gun (and maby fingers)..
Just my opinion, hope that helps.
"A free people ought not only to be armed and disciplined but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." --George Washington
g20gunny is offline  
Old November 28, 2012, 08:57 AM   #3
Senior Member
Join Date: November 2, 2007
Location: Northern Orygun
Posts: 4,923
I agree with gunny. The 6.6G and 6.8 reduces the bolt lug strength and loading up the Grendel often sears bolt lugs.

If you want more power, a 7.62 AR platform is the way to go. .260 to .338 Federal and no worry on lugs breaking.
madcratebuilder is offline  
Old November 29, 2012, 05:45 PM   #4
Senior Member
Join Date: September 25, 2011
Posts: 147
+P in 5.56 exists, its called proof loads.
Sinlessorrow is offline  
Old December 1, 2012, 04:05 PM   #5
Senior Member
Join Date: January 15, 2011
Location: Deep South
Posts: 164
ARPerformance makes a 6.8 "super bolt" that is reinforced.
greentick is offline  
Old December 1, 2012, 09:08 PM   #6
Senior Member
Join Date: May 18, 2004
Location: Minnetonka, MN
Posts: 117
How do you plan on obtaining accurate pressure data?

It sounds like a good way to kaboom to me.
goalie is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 08:45 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2016 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.06020 seconds with 9 queries