New AR15 caliber...

[ELKBURGER]

Very cool info. Thanks guys

[NW-GSP]

I'm running a 6.8 spc Ar. .270 bullet out of a 30 caliber case.

[luvmystang67]

I see your .25 and raise you a 6.5 Grendel...

On a serious note, I don't know why they think this would be more popular than the other AR offerings currently in existence...

[swashington2128]

One other caliber to think about is the 300 blackout. It is a 223/556 trimmed down below the neck and then resized to give it a new neck. The advantage with this one is you can use the same lower and magazines as the 223/556. I reload these using 150 gr Sierra Game King bullets and get good power/penetration and good ballistics at least to 200 yards. Shoot it out of a an AR with a suppressor and you have a silent deer killing machine.

All of the shots I have taken at deer in both East and Western WA have been under 50 yards and this is perfect for that. If you want to go crazy you can load a 200gr bullet and get subsonic and really be quiet in the woods.

Building an upper is simple also. Just order the barrel and everything else is the same. Same upper, gas block/tubes, and barrel nut. The only thing different between your AR 223/556 and 300 BLKOUT uppers is the barrel and the threading for the flash-suppressor because of the diameter of the barrel.

Keeps this a pretty inexpensive way of doing things.

[6.8mmARHunter]

Lots of options...

There's also something called the .277 Wolverine.

.556 Case, necked up to .277.

Check the web site:

http://www.maddogweapons.com/277-wolverine.html


I run a 6.8mm SPC II and a .458 SOCOM, so I don't have room in the safe for yet another. I need a bigger safe.

[mountainman]

Caliber has been around for a long time in the TCU offerings. Great conversions in rifle. Hunted with one of the first prototyoes from Blackhole Weaponry in 6mm-223. Super accurate and easy to reload. Shot lots of chucks, and worked on a midling bear.the .25 should prove no different. The TCU line works best for big game with the lighter varmint bullets at the lower velocities

[WoodlandShooter]

My 243WSSM AR does a good job!!!

[AWS]

One minor correction.  The "25 Copperhead" is based on the 222 Rem, Wooters built it with the longer neck case to run cast bullets and still give him plenty of room in his small Sako action.

Years ago I looked at a bunch of 25 cal Cats on the small bolt face from the 25-222 Rem to the 25-50 on the 5.6x50Mag case

The year after the 204 Ruger was introduced I necked it up to 25 cal to clone the 257 Kimber without having to do any fireforming.  It has become my goto deer rifle.  I did it on the cheap and used a 204 Ruger  Redding Type "S"  FL Bushing die with the guts changed out to .257 and a slight openning of the throat of the die for the larger neck of the 25. I use the same die to load the 22-204, 6mm-204 and the 25-204 by just changing out the expander ball and bushing.  If the 25x45 Sharps is on a standard 223 case you could do the same with a 223 bushing die..

If I were going to try and build another 25 on a Mini Mauser or CZ 527 I'd look seriously at the 25x39 on the 7.62x39 case.  Both actions are availible with the correct bolt face for the 7.62x39.

On an AR-15 platform that doesn't have boltface or case diameter restrictions the WSSM case would be the way to go with the 25 WSSM matching what you can get out of the 25-06.

[300rum]

6.5 Creedmoor is on a .308 platform.  Your probably thinking 6.5 Grendel? 

Why not just build a 6.5 creedmore ar

[slm9s]

I see your .25 and raise you a 6.5 Grendel...

+1

[WoodlandShooter]

yup, the WSSM has it's benefits in a AR, but the brass and factory rouds are almost non_existant.

However, being able to push a 105 A-MAx to 3075 FPS in a lightweight semi-auto rifle that has no recoil (put a PRI Muzzle brake on mine) is freakin cool!!

[Netminder01]

tag

[Biggerhammer]

Like mentioned earlier in the thread the 25x45 has been around a looooong time. I have built several, it's a fun chambering and of course limited in performance due to the case size.  I just couldn't take a AR laying around with a 6x45 barrel on it, so I swapped it out to a .264 LBC/ 6.5 Grendel. Next go around, I'll go .243 LBC due to the bullet selection and BC.

[yorketransport]

I love the fact that a lot of the "new" chamberings offered in the AR are just re-branded wildcats. My first thought when I saw this was that they should have gone all out and just improved the case to make it a true 25 TCU. I have to bite my tongue every time somebody asks me what I think of the "new" 300 Blackout.

If only somebody could come out with a new/unique cartridge for the AR platform that could throw a bullet with a BC of .5 or better at 2700 fps from a 20-22" barrel. I might even consider owning an AR then!

Andrew

[JimmyHoffa]

You can get an AR-10 that should do what you ask.