Wild World Search For New Case Design

[constructor]

Interestng artical but, I have no interest in throwing lead,and
more interest in a caliber that is accurate enough to set RECORDS @ 600 yds+ and still function in the AR as it is.
Would also like to see the Military make the AR Piston Driven,
for that would keep them running longer in dust and mud.

You lost me, you started the post looking for a case that would shoot .500 BC bullets in the AR. I just showed you 2 that have 95 SMKs in them and will shoot 1/2 moa and now you're not interested in throwing lead?
but you are interested in a caliber that will set records at 600yds and still function as it is but, wish the military would do it in a piston system?
Take a piston operated rifle and shoot for groups then spin the gas block to cover the port and shoot for groups again. If you want records it's not going to happen with a piston gun unless the barrel is stiff enough to stop the reaction and that IMO would be too heavy for a combat rifle.
Edit- I am assuming now you are referring to the article on p5.
#2 in the photo in the link is a 6.8 necked down to 5.56, #3 is a 6.8 necked down to .243 both have been shortened so they can be used at mag length with the 75 Amax and the 95 SMK. Both of those rounds work well in SA or FA operation and PRI makes mags that allow them to be loaded to 2.3" 27 will fit in a mag the same size as the 5.56 mag.
A DMR type rifle is expected to make hits at 500 yds, both of those will do it much better than any current 5.56DMR in active use. Both of them shoot flatter than a 308 out to 500yds. They don't hit as hard as a 308 though.

 

[relictrader]

Sorry these numbers thru me.260 Scenar..243...6.5)

The piston operated rifle seems to have a love hate following of those who experenced failures and those who say they spend more time cleaning AR15's than any other weapon.Some AK owners have never cleaned,but the Marines love the Ak's in close combat over the AR's,privately).

Quote; it's not going to happen with a piston gun unless the barrel is stiff enough to stop the reaction and that IMO would be too heavy for a combat rifle.

I wish I understood more about the gas systems being used in AR's,
for if the industry's building these guns was "Pushed" to cover the subject something new might come of it.

 

[constructor]

I've been working with the 6.8 for about 3 years and it's much faster with the correct twist,11 or 12) and chamber,DMR for accuracy) than any published data shows. At the moment no one makes a decent bullet for long range but Berger is working on one now that the .277 130s are done.
I'm getting 2950fps from a 90gr and 2800 from the 110 TSX out of an 18" barrel.

I've built 2 wildcats based on that 6.8 case and 2 based on the Grendel case. IMO the 6.8,30 Rem.) case works better in the AR platform. and fires full auto just fine. Someone also makes a 6mm FMJ bullet.
A 18" barrel may not be the best for CQB or long range sniping but it's a damn good compromise.

Yep, 260,243 and 6.5 Reaper are all AR10 cartridges. The 5.56x42, 6x41 and both Banshees are AR15 Cartridges.

 

[relictrader]

I have been looking for the 6mm WOA to break a records and probly will soon.This Hager with 24inch Kreager Barrel is long enough, but the over all case lenght with Berger 90's is restrictive unless Magazine is opened in front.
I like the velosity,3000)with the 90's and feel that 600 yds will be the goal for this Hollinger gun.

 

[constructor]

The WOA case is too long for mag. length bullets like the 95SMK or 90gr Scenar, the point of tangent of the ogive is back inside the case. That is exactly why I shortened the case to make it a 6x41. I didn't move the bottom of the shoulder I just changed the angle and shortened the neck a little.

 

[relictrader]

Sounds like you have done your homework or these two cartage's.

The thing that impress me the most is the high VLD bullet selection available,and the fact that 110 gr. Tubbs should work
with my 105/108 gr.throat by useing the single shot bolt.
I would love to chronograph the average velocity at 600/800yds.

 

[relictrader]

That is exactly why I shortened the case to make it a 6x41

Is the 6x41 able to maintain enough velocity for 600 yds using the 95 gr bullets?

What made the 6mm Hagar choice simple was the 32gr of Water-Capacity,plus the 223 20rd Magazines excepts the 20 rds of 6mm Hagar without changing the follower.Bullet weights of 105/108/110grs will also benifit with the added velocity.