Next Rifle? 6.8? Maybe a 300blk?

rivetc78

rivetc78

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I built my MK18 clone. A 10.5" Shorty.
arnxs2.jpg

If my Barrel ever gets here, my 18" SPR-ish build will get done.

So what is next? What would get me the most bang for the buck in an AR?

Should I go 6.8SPC? It's been around long enough it is almost consider common.
The 6.8 should get more distance than the 300

Then there is the neat little 300BLK, it is taking over by leaps and bounds.
Every Manufacturer is doing a 300 now.


Hmmmmm. I have had the AR-10's, fantastic Rifle, just want something lighter and with cheaper ammo and mags.

Any pros or cons between the 6.8 or 300blk?
 
I think you should do a .300 blackout. Same mags as .223 and you could even make your own brass out of .223 brass. a neat caliber. Being able to make your own brass is huge since getting ammunition that isn't mainstream is "challenging" at the best of times.
 
I would choose 6.8 spc , while my knowledge is limited on both cartridges , i believe 6.8 is easier to get if you dont reload , i havnt seen any factory 300AAC/Blkout for sale anywhere apparently from what ive read its a reloader special only .

Ive seen factory 6.8 for sale though. however both are impressive rounds , theres one guy on here with a 300blkout build but i cant remember his name .. check around im sure youll find him .
 
From what I've read, 6.5 Grendel is both more accurate and longer ranged than 6.8 SPC, has slightly less impact at short range but greatly superior impact at long range, and both beat the bejabbers out of 300 BLK. The only time 300 wins is if you shoot subsonic out of a silenced rifle -- and you can't do that here.

Mind you I'm getting my knowledge from Wikipedia. :p
 
Don't you already have an AR in 300 Whisper? I dobn't think there will be that much difference with a 300blk, not to mention I am not too sure if any 300blk stuff have filtered into Canada yet.

6.8 SPC would give almost the performance of a .308, with less weight, but the ammo cost is not much better, especially with the new cheaper MFS .308 ammo in Canada.
 
The 300 Whisper (BLK) is a great little round.

With supersonic ammo it replicates 7.62x39 ballistics yet it can also operate in the subsonic realm.

The nice thing is that due to the small amounts of powder it burns, it is much quieter than any of the larger cartridges.

You also need to shoot a 200+ gr subsonic bullet to believe what it can do. The penetration power of that massive bullet is imense. I think this is the only round where the bullet is longer than the case. :)
 
Suputin said:
The 300 Whisper (BLK) is a great little round.

With supersonic ammo it replicates 7.62x39 ballistics yet it can also operate in the subsonic realm.

The nice thing is that due to the small amounts of powder it burns, it is much quieter than any of the larger cartridges.

You also need to shoot a 200+ gr subsonic bullet to believe what it can do. The penetration power of that massive bullet is imense. I think this is the only round where the bullet is longer than the case. :)
Click to expand...

Why would you wish to replicate 7.62x39? :confused:
 
What's not to love about the 300 Blk? Everything except the barrel is interchangeable with a 5.56 and because it is SAAMI certified, there should be a decent future supply of factory ammo available.

To me it's not about squeezing out every single FPS or ft lb of energy. It's being able to use all of my current 5.56 parts and even cases (once cut down and reformed) with a 30 caliber bullet. I am eagerly waiting for the first available 300 Blk barrels to arrive in Canada. I will definitely be picking up one or two short barrels (7.5 to 10.5") to add to my AR shooting enjoyment.
 
rivetc78 said:
6.5 Grendel has died a slow death I think.
Click to expand...

I'm not so sure about that, you may be right though and for some time it was looking that way, but last October Alexander Arms gave up the patent, so it can now be SAMMI standardized(something that Hornady already tried to do, but failed BECAUSE of the patent), so whenever that (hopefully) is approved I'm betting we'll start seeing it showing up far more often. :D....maybe:(
 
Go 300BLK...I'd like to see how that turns out for you as I'm contemplating doing the same thing...it's also nice to reuse the mags...
 
I'd go .300 Blackout for a lot of different reasons:

(1) The cartridge is extremely flexible in terms of supersonic/subsonic use.
(2) Commonality of hardware with .223 Rem. platform. Using the same mags without having to buy more to accomodate another cartridge is big plus.
(3) Logistics! Just about everyone has a .308 Winchester and I can use similar weight bullets in the .300 Blackout as I do my .308 Win. bolt action rifles.
(4) The .300 Blackout is an efficient cartridge works exceptionally well in a wide range of barrel lengths from 7.5"-20" in length. That kind of flexibility is well suited to the AR platform, where you can change weapon configurations within seconds.

AND

(5) You won't be cool unless you have one... ;)
 
2bad4u2 said:
I'd go .300 Blackout for a lot of different reasons:

(1) The cartridge is extremely flexible in terms of supersonic/subsonic use.
(2) Commonality of hardware with .223 Rem. platform. Using the same mags without having to buy more to accomodate another cartridge is big plus.
(3) Logistics! Just about everyone has a .308 Winchester and I can use similar weight bullets in the .300 Blackout as I do my .308 Win. bolt action rifles.
(4) The .300 Blackout is an efficient cartridge works exceptionally well in a wide range of barrel lengths from 7.5"-20" in length. That kind of flexibility is well suited to the AR platform, where you can change weapon configurations within seconds.

AND

(5) You won't be cool unless you have one... ;)
Click to expand...

So quick question, if there are a lot of commonalities with the .223, can I just build a 300BLK rifle with AR15 parts, and just change the barrel?
 
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