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View Full Version : AR10 in . . . . . .303 British??


glassparman
10-09-2012, 11:30 AM
OK, don't laugh . . . well, go ahead, just not in the thread!

So, I have different firearms and I reload all my own ammo. The problem is that I really want to keep my calibers that I reload down to a minimum to save costs.

I love my enfields and reload a ton of .303 British.

Sooooooo, what would it take to build an AR10 in .303 British instead of .308?

I realize that the .303 OAL is .275 longer than the .308 round. But, what if??

Curious about peoples thoughts on "Having too many calibers to reload"
and "AR Builds in different calibers that deviate from standard mag well size".

Now, if someone has a Globco Mohawk 555 to sell . . . . I could end all this mad thinking!! :43:

paul0660
10-09-2012, 11:31 AM
rimmed vs. unrimmed. No idea.

POLICESTATE
10-09-2012, 11:36 AM
Yeah the rimmed vs rimmless is going to be a factor to some extent. Obviously the magazine and the extractor will come into play on that, otherwise it should be doable after a lot of tinkering.

Good Luck!

nothing4u
10-09-2012, 11:47 AM
You'd have to open up the ar10 bolt, mess with the extractor, and new barrel is about it.

Bhobbs
10-09-2012, 11:52 AM
I doubt it would fit through the mag well.

FMJBT
10-09-2012, 11:57 AM
You might have to go with a different magazine due to the rimmed case. Something like a 7.62X54R magazine from a VEPR, PSL, Dragunov, etc. Then open up the magwell to take that mag and figure out a way to get it to stay there.

Personally, I think it might be easier to convert your Enfields to fire 308 ;)

a1c
10-09-2012, 12:02 PM
It might be easier to build if you go bolt action.

glassparman
10-09-2012, 1:43 PM
It might be easier to build if you go bolt action.

My intention is to go with semi-auto. The only one that I know of was produced in Canada from an SVT40 - Globco Mohawk 555. Can't find one so I thought about my own build.

wash
10-09-2012, 2:06 PM
Aren't Brens .303?

glassparman
10-09-2012, 2:28 PM
Yeah but that thing is huge and you stare down practically on top of the "top-load" magazine.

wash
10-09-2012, 2:40 PM
But it would actually work...

CK_32
10-09-2012, 4:36 PM
Is that caliber even really avalible..?

Kind of a bad idea if that's a fading out round and have 2 rifles instead of just 1 you can't feed...

If its readily avalible ammo please ignore my lack of knowledge and go for it :)

ar15barrels
10-09-2012, 11:01 PM
Rebarrel your enfields to 308.
Load 308 for everything.

FMJBT
10-09-2012, 11:09 PM
Just make sure if you rebarrel for 308 to load the rounds at reduced power. The actions on the old rear locking Enfields are not really up to the task of handling full power 308 for very long. 7.62 NATO would probably be okay, but I'd still keep a wary eye on headspace. (I check mine after every range trip, so far it has held up to rounds loaded down to 303-ish velocity levels.)

joker70
10-11-2012, 10:02 AM
Never been done before... It's a game changer.

donw
10-11-2012, 11:38 AM
the .308 would have to be rechambered to .303...rimmed...

IMO too many problems to be overcome... too much time money and effort...

hermosabeach
10-11-2012, 12:05 PM
They make an AR style rifle in Lapua .338

So it is possible

At the end of the day you would spend a ton of money

More than trading your brass for a common AR round

As the AR does not have a variable gas system such as the FAL or L1A1 you would need to mess with building a gas system as well as bolt and magazine to accept a rimmed cartridge

I think a 7.62x 54R conversion would be easier than having all build for you or by you from scratch

How does the .303 brit compare with the 200 grain 762x 54r loads?

LRShooter
10-11-2012, 12:09 PM
Seems like it be alot less headache just to load up a bunch of .308. They'd only take up another ammo can or two of space.

hermosabeach
10-11-2012, 12:18 PM
Or buy one like this

http://www.gunauction.com/buy/6729696/globco-mohawk-semi-auto-rifle-.303-british

badreligion
10-11-2012, 12:32 PM
Not going to happen with an AR-10. There are no magazines available for that round and if you made one to fit the round it won't fit the mag well. Then you have the problem of a rimmed case vs a non rimmed case in relation to the bolt and its operation. Then you have a barrel problem. The 303 is a .312 barrel vs a 308/7.62 is a .308 barrel so your looking at a custom barrel that may have headspace/pressure issues in relation to the bolt. Plus it may require a custom gas system. If anything broke or went wrong its going to cost you a lot to fix.

It would be cheaper to buy the required reloading equipment for 308 and enough components for a few thousand rounds than to take on this type of custom rifle.

rojocorsa
10-11-2012, 1:34 PM
Either make the Enfields .308 or just suck it up and shoot both .308 and .303.


.303 AR seems like more trouble than its worth. (And even more so considering .308 is ballistically superior).

Super Spy
10-16-2012, 8:59 PM
Starting off with something like the SVT-40 designed for a &.62x54R or anything else chambered for a large rimmed cartridge means you won't have to Fark with the magazine or retaining it. Just screw with Bolt, Barrel, and maybe extractor. A VEPR in 7.62x54R would probably be a good starting place to.

mohawk94
03-26-2013, 2:29 PM
ihave 2 mohawk 555 OK, don't laugh . . . well, go ahead, just not in the thread!

So, I have different firearms and I reload all my own ammo. The problem is that I really want to keep my calibers that I reload down to a minimum to save costs.

I love my enfields and reload a ton of .303 British.

Sooooooo, what would it take to build an AR10 in .303 British instead of .308?

I realize that the .303 OAL is .275 longer than the .308 round. But, what if??

Curious about peoples thoughts on "Having too many calibers to reload"
and "AR Builds in different calibers that deviate from standard mag well size".

Now, if someone has a Globco Mohawk 555 to sell . . . . I could end all this mad thinking!! :43:

Cypriss32
03-26-2013, 2:44 PM
I'm unsure if the ar10 bolt has enough material. Is the 303 a .478 case like 308?

Army GI
03-26-2013, 3:06 PM
But seriously, if you're willing to spend thousands of dollars it can be done. But don't expect it to be an easy task, you'll have to find a gunsmith who is willing to do the work (because he'll definitely charge you for it).

IMHO, go with what your heart desires.

People said there would never be an AR that fires 7.62x39, reliably from a 30 round magazine, but guess what?

bruss01
03-26-2013, 3:13 PM
I would think it would be time and effort better spent on reworking the Enfields to 308.

I don't think you're going to be able to accomplish this within the realm of feasibility. Is it possible? with enough time, effort, persistence and MONEY... almost ANYTHING is possible. The question is, does it solve more problems than have to be overcome to achieve it. In my opinion, you'd have a hard time justifying it. Your money would be better spent on a large supply of .308 ammo - and for what it's likely to cost you, that would be quite a nice pile of .308 even at today's prices.

Arnelcheeze
03-26-2013, 3:15 PM
custom barrel, barrel extension, whole new designed bolt, extractor, and possibly the carrier too. The whole rimmed vs unrimmed makes it a GAME CHANGER. It may be "easier" to start base with a VEPR 7.62X54.

nastyhabts26
03-26-2013, 3:17 PM
But some people are missing the point.
What he wants to do is build an AR 10 in 303 Brit.
He doesnt want a 308, he doesnt want to rebarrel or modify his Enfields.
Give him advice on what he wants to do and the challenges he must face to do it.
Dont tell him to do something else.
Either give helpful information on the project he wants to do or shut the **** up!

Army GI
03-26-2013, 3:21 PM
But some people are missing the point.
What he wants to do is build an AR 10 in 303 Brit.
He doesnt want a 308, he doesnt want to rebarrel or modify his Enfields.
Give him advice on what he wants to do and the challenges he must face to do it.
Dont tell him to do something else.
Either give helpful information on the project he wants to do or shut the **** up!

YES THANK YOU!

I was thinking the same thing.

ar15barrels
03-26-2013, 10:23 PM
custom barrel, barrel extension, whole new designed bolt, extractor, and possibly the carrier too. The whole rimmed vs unrimmed makes it a GAME CHANGER.

Also a new lower to accept custom made magazines.
Given large sums of money, anything is possible.
I wish I had such large sums of money to throw around.
It must be nice to have such problems...

tuna quesadilla
03-26-2013, 10:27 PM
You're going to be spending thousands upon thousands of dollars just to save a few cents per round on something that you're going to shoot... how often? Maybe once every couple of months?