name your weapon and why (no crazy beta mags) 20 rd box mag for .308 and 40 rd max for .223

im surprised to find myself voting for the heavier round

Sterling silver gravy assault spoon

Proper battle rifle vs weak AR-15 bullchit?
Lawl pls go

Never served or anything like that, but fuk that carrying around a round that weighs almost twice as much.

Both.

5.56 is lighter so can carry more ammo, and the rifles tend to be lighter. So would grab my mk18, until I can get an SR-15.

If I wanted 7.62 I'd grab either my SCAR or HK.

If I was gonna have to be on the move I'm grabbing the 5.56. If I was gonna be posted up in a window defending a house I'd probably grab the 7.62.

you do realize this was a massive debate in the mid 50s over what caliber to use

i really hope thats not you in your avi

urban warfare, youre on the move sometimes but spending time in static positions about half the time, for example

What's the situation scenario?

If I'm by myself, 5.56 AR. Part of a team? 7.62x51.

x51 rifles themselves tend to be heavier, and intended to shoot further.

5.56. It's better at pretty much everything. Terminal ballistics of 5.56 ball in CQ are equal or better to 7.62 expanding rounds. Lighter. More capacity.

EASY 556 WIN then. For one it would be the 556 no matter what because I have actual training and experience using 556.

But aside from that ammo supply, weight, ballistics of 556, and ease of movement on a 10.5" barrel. Less recoil means more rounds on target faster.

5.56. I'd rather have a ton of ammo on me.

a 5.56 Ar15 is every bit as deadly as a 7.62 and even more so in some situations.

or just get an AR chambered in .50 beowulf if you really want

i think the reason was the improved ballistics of the heavier .308 round were not enough to offset the fact that the soldier would be able to carry about double the amount of .223 ammunition into battle

also fighting in the jungle (which was pretty much the environment for which the m-16/ar-15 was designed) would mean that combatants would be engaging each other at less than 100 yards so the light .223 round would not have a problem cutting through some brush and still delivering a kill shot

your average .223 fmj slug weighs 50 grains, maybe a bit less just for the sake of simplicity. 45 grains =3 grams per slug

.308 fmj weighs 180 grains=12 grams

15 grains per gram

muzzel velocity of a .223 is what 4000 fps or about 1300 m/sec

muzzel velocity of a .308 is 2870 fps about 930 m/sec

formula for kinetic energy is E(k)=m(kg)/2 x (v(m/s))^2

kinetic energy of .223 is E(k)=.0015(1300)^2= 2,500joules

kinetic energy of .308 is E(K)=.006(930)^2=5,189

so the 7.62x51mm has double the kinetic energy

the formula for momentum i p=mv, which is just mass times velocity

for the .223 =.003(1300)=3.9 (kg.m)/sec

for the .308 = .012(930)=11.16

more momentum and more kinetic energy, at the cost of weight and ammunition

uh, any realistic loadout is going to be 55 gr for the 5.56 and 147 gr for the .308. 180 gr bullets are hunting loads, and 50 gr .223 bullets are for varminting.

Because unless you jump through massive hoops, you are going to be semi-auto, go for the 7.62x51. The reason for the 5.56 is recoil control in auto mode and being able to carry large amounts of ammo because you are using a lot. Not likely to happen even in a SHTF situation or civil war. Follow up shots with the 5.56 will be easier but the thump comming from the larger rounds makes it a no brainer.

Now there is a 6.8SPC, 6.5 as well that is a good middle of the road. Also variants like the 300BLK. So many options with the same AR15 platform. I think you can even get .308/762x51 in the smaller AR15 platform but the AR-10 platform isn't that much bigger. Held a AR10 once with options and it was just like a AR15 but a little bigger around the base.

it depends on the intended use, both have their pros and cons.

be that as it may though, a 5.56 AR is a more well rounded tactically capable weapon