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Message
AR calibers: Help a noob out.
Posted on 7/1/14 at 1:10 pm
Posted on 7/1/14 at 1:10 pm
So I am a little confused on the purposes on some of the calibers.
What is 6.8 and why would you want it?
What is 300 Blk and why would you want it?
Why a 7.62 over .223?
What is 6.8 and why would you want it?
What is 300 Blk and why would you want it?
Why a 7.62 over .223?
This post was edited on 7/1/14 at 1:11 pm
7
Posted on 7/1/14 at 1:16 pm to Hu_Flung_Pu
I got the 300blk in my latest AR because I wanted something heavier than the 5.56 and I wanted it to be quiet. I can shoot 110 grain bullets or 220 gain. My can has not arrived yet but I've shot several other suppressed 300blk and it's quieter than a 22lr.
If you're considering the 300blk but don't think you'll ever get a can, get a 308.
If you're considering the 300blk but don't think you'll ever get a can, get a 308.
Posted on 7/1/14 at 1:17 pm to Hu_Flung_Pu
I use my 6.8 for deer and hogs, it is bascially a necked down .270 - great round for the size of deer and hogs in La...
Posted on 7/1/14 at 1:20 pm to swanny297
quote:
I use my 6.8 for deer and hogs, it is bascially a necked down .270
Why not just get a .308? Can a 5.56 upper be swapped for a 6.8? Is that the reason not to choose a .308?
Posted on 7/1/14 at 1:20 pm to Hu_Flung_Pu
quote:
What is 6.8 and why would you want it?
Bigger and slower - trying to be the .40 S&W of the semi-auto world. I think it is the best alternative to 5.56mm in an AR, and the best compromise between firepower and stopping power in the platform, but I also like the .40 in pistols.
quote:
What is 300 Blk and why would you want it?
Trying to be the 7.62x39 of the AR world. It is newer, it's sexy, but I'm still concerned about cost and availability.
I'm watching and waiting to see if there is widespread adoption of either of the above.
quote:
Why a 7.62 over .223?
Well - if you mean 7.62x39, I wouldn't be interested in the AR platform - I'd probably go with either 300 BLK for the equivalent or just get an AK.
Deviating from a tried and true engineering combo is inviting problems you don't want in a firearm.
A compromise choice would be a Mini-30 - they've been making them long enough that the issues are known - I've been around thousands of AR variants, and not a single one of them was ever in 7.62x39
Now, if you meant 7.62 (300 BLK) over .223 (I would correct you to use 5.56mm, the traditional chambering, because there is an important enough difference for this to be emphasized), then your question is redundant to the second part.
This post was edited on 7/1/14 at 1:23 pm
Posted on 7/1/14 at 1:23 pm to Ace Midnight
The nice thing about the 300 is it on;y requires a barrel change. Everything else is standard 5.56, mags, bolt, etc...
Posted on 7/1/14 at 1:23 pm to Ace Midnight
quote:
Ace Midnight
Like I said I am a noob on these calibers.
I thought 5.56 was a .223 but just shaped a little different and different powder loads.
I thought a AR10 was a 7.62 or .308.
Posted on 7/1/14 at 1:29 pm to Hu_Flung_Pu
A standard AR will shoot .223 or 5.56 ammo. What do you plan to use the rifle to do? If you are going to plink and want it for home defense I would suggest sticking with the 5.56 because ammo is cheaper and it has almost no recoil.
Posted on 7/1/14 at 1:32 pm to Hu_Flung_Pu
quote:
What is 6.8 and why would you want it?
What is 300 Blk and why would you want it?
Why a 7.62 over .223?
How much do you want to spend on ammo?
Posted on 7/1/14 at 1:33 pm to DanTiger
quote:
What do you plan to use the rifle to do?
I already have the 5.56 for plinking. I was just curious as to why there are so many calibers.
Posted on 7/1/14 at 1:34 pm to Hu_Flung_Pu
big difference is going to be price and availability.
What do you plan on doing with the gun?
What do you plan on doing with the gun?
Posted on 7/1/14 at 1:35 pm to Hu_Flung_Pu
quote:
I already have the 5.56 for plinking. I was just curious as to why there are so many calibers.
ARs are the Legos of the gun world, they make it so you can mix and match
Posted on 7/1/14 at 1:35 pm to Hu_Flung_Pu
quote:
I thought 5.56 was a .223 but just shaped a little different and different powder loads.
SAAMI classifies them as 2 separate calibers - a way to think of it is a non-magnum difference between .38 special and .357 - all .223 ammo can be used, relatively safely and reliably in military chambered 5.56mm - the problem is using mil-spec 5.56mm in a sporting firearm chambered for .223 - as the specs call for identical dimensions, there is generally no problem chambering a 5.56mm round in a .223 chamber - however, you have throat size and headspace differences between the chambers and this increases chamber pressure with this combination. This is asking for problems - extraction issues, primer issues, and, potentially, catastrophic failure.
On the other hand, .308 Winchester and 7.62mm NATO are considered interchangeable by SAAMI - and in this case, the civilian .308 tends to have higher pressures - but because of the overengineering of the .30 caliber chambers, I think it less of a safety issue, unless you're using beefed up medium-to-big game cartridges in a more budget 7.62mm NATO weapon, but I would certainly not trust handloads or a heavy dose of .308 heavy loads without consulting the manufacturer and perhaps SAAMI resources - anything out of spec with factory .308 would be off the table for my 7.62mm semi.
This post was edited on 7/1/14 at 1:39 pm
Posted on 7/1/14 at 1:36 pm to NYCAuburn
quote:
What do you plan on doing with the gun?
Mainly target shooting. MAYBE one day go hog hunting since we do have them on our property.
Posted on 7/1/14 at 1:36 pm to swanny297
quote:
...my 6.8 for deer and hogs, it is bascially a necked down .270
A 6.8 is a .270. I think you meant that it is a .270 with a shorter case. In other words, it is a .270 with less powder space which translates to less velocity and energy than a 270 Win.
Posted on 7/1/14 at 1:46 pm to Hu_Flung_Pu
you considered the 204 ?? 
Posted on 7/1/14 at 1:50 pm to oleyeller
quote:
204 ??
eta: no lol
This post was edited on 7/1/14 at 1:51 pm
Posted on 7/1/14 at 1:50 pm to oleyeller
Can you even get the 204 in an AR platform.
Posted on 7/1/14 at 2:06 pm to greasemonkey
why frickin yes u can
Posted on 7/1/14 at 3:11 pm to oleyeller
With the .300blk, 6.8, .204, etc you can use an AR-15 lower and just swap out uppers.
The 6.8 does require different magazines however. Not sure if some of the other calibers do. I do know that .300blk does not require new mags.
I'm inthe process of building a 6.8. Going very slow however.
The 6.8 does require different magazines however. Not sure if some of the other calibers do. I do know that .300blk does not require new mags.
I'm inthe process of building a 6.8. Going very slow however.
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