Rebating 308 cartridges for a AR-15

[RonS]

I am working on a future project to shoot a custom 308 from an AR-15 upper. Can someone tell me where I can have some 308 cartridges cut to the same base size of a PPC case? Do you think the case will be strong enough? I plan to use Lake City brass to do my initial load development, then I will probably use Lapua brass after that. I plan to have a barrel done without a gas port, my upper has a side charging handle and I have a DPMS single shot lower receiver. Any thoughts on this will be greatly appreciated.

RonS

 

[Dusty Stevens]

No problem rebating the rims to the ppc size- most make a form tool and cut the groove and base in one operation. Your issue may be with the gun itself. Feeding problems and the like. Theres a reason the AR10 and 308dpms size came about

 

[Ggmac]

Are you making a straight pull action or bolt action ?

 

[DaveTooley]

He said single shot, no gas port, straight pull on an AR upper mounted on a single shot lower. Just saying.

 

[DaveTooley]

Remember the bolt and barrel extension were not designed to carry the bolt thrust of a 308. I think you'll start breaking things rather quickly.

 

[RonS]

Dave, is it possible to fit a AR-10 barrel extension in a AR-15 upper? Or what do you think is a safe pressure range for a AR-15 bolt and barrel extension is? As I stated this is a custom 308, I'm not interested in shooting past 600 yards nor am I looking to shoot HEAVY bullets.

 

[Pappy42]

Interesting

 

[RonS]

where can I get the tool made to rebate the brass in one cut? I have access to a small lathe and I figure I can use a L.E.Wilson case trimmer holder in the lathe...

 

[Eddie Harren]

where can I get the tool made to rebate the brass in one cut? I have access to a small lathe and I figure I can use a L.E.Wilson case trimmer holder in the lathe...

Grind one yourself.

 

[BigBlueandGoldie]

In a single shot application, I'm not sure why you wouldn't just go with a bolt action?

 

[Rustystud]

I beleive your going down a rabbit path that has already been run. Your looking at a lot of both work and expense for something experimental that has not been very successful for others. I would recomend that you consider using an AR-10 platform.
Just my 2 cen s worth.
Nat Lamneth

 

[Liven The Dream]

They made 6BR AR15 uppers for a while ???? Pressure Problems ,Uppers started to come apart.
The barrel extension is to small to handle the job.

 

[RonS]

I originally thought of using a bolt gun but remembered I had the upper and lower sitting in the corner [been looking for something special to use them with] for about four or five years. A bolt gun would not be a problem, I can go back to that, I would only need to get the reamer and gauges made and the barrel.

 

[Ggmac]

No , I meant are you building the AR as a bolt gun .
Obviously not , have you checked into the remington R-15 bolt head for the 30 ar remington?

 

[Ggmac]

Just read other replays and agree , 6 pPC runs high but your into shoot once , call paramedics , if possible , pick up shrapnel.
The rem R-15 used a large barrel extension and bolt to fit it and a ar-15 modified bolt carrier .

 

[RonS]

Yes it is going to be an AR as a bolt gun, in whatever cartridge I end up using. I looked at the Olympic Arms WSSM upper as well as the Remington, I don't care for the look of the AR A3 uppers, I have no need for the forward assist or deflector. Also I don't like the idea of having to get out of position to charge or eject a round. I'm just saying....

 

[hpshooter]

I researched a similar idea for a 6.5 Credmore on a 308 receiver. One real problem that was pointed out is poor primary extraction force with the AR operating as a bolt action.

You may find the thread under my name on this forum. Laurie form England has tried this and commented on it in the thread.

T W Hudson

 

[RonS]

hpshooter, I searched for that thread but no such luck

 

[hpshooter]

Ron,

Search for "UK style side charging details". It was posted April 16th, 2015.
It may be of some help.
TWH

 

[DaveTooley]

Dave, is it possible to fit a AR-10 barrel extension in a AR-15 upper? Or what do you think is a safe pressure range for a AR-15 bolt and barrel extension is? As I stated this is a custom 308, I'm not interested in shooting past 600 yards nor am I looking to shoot HEAVY bullets.

What does distance and bullet weight have to do with your safety? 6.5 Grendel is no slouch to 600 yds. and is doable ,