5.56 vs .300blk

[DucatiRon]

300 blk at it's best still works on magnum pistol velocities and magnum pistol pressures. It is not a rifle round just because its shaped like one and goes in one.

[MMH]

300 blk at it's best still works on magnum pistol velocities and magnum pistol pressures. It is not a rifle round just because its shaped like one and goes in one.

The round is VERY similar to the 7.62x39 round (125 gr.@2200 fps for 300BLK vs. 122 gr.@2400 fps). Who knew that all those AKs were shooting pistol rounds. Silly Russians...

[DucatiRon]

The round is VERY similar to the 7.62x39 round. Who knew that all those AKs were shooting pistol rounds.

Specs are specs. 300 blk shoots a 125 pill in 30 caliber equivalent to a 357 Maximum velocity and pressure. In a 220 pill it shoots just faster than a 45 ACP with a 230. It is what it is

No where did I mention bashing the commies. That is for another thread another time.

[knight0334]

Just my opinion...

.300BlackOut would only interest me in suppressed situations and 150yds or less.


If choosing between the two, I personally would go with 5.56 because of the availability of spare barrels and ammunition. My AR's only purpose is SHTF and having a firearm that is in common use of the time for compliance to old-school militia duties. ...same reason that I have a Beretta 92FS.

[MMH]

Specs are specs. 300 blk shoots a 125 pill in 30 caliber equivalent to a 357 Maximum velocity and pressure. In a 220 pill it shoots just faster than a 45 ACP with a 230. It is what it is

No where did I mention bashing the commies. That is for another thread another time.

Let's see if I can follow the comparison:

357: 158 gr.@1250 fps = 550 ft.-lbs.; max. pres. (per SAAMI) is 35,000 psi
45: 230 gr.@850 fps = 370 ft.-lbs.; max. pres. (per SAAMI) is 21,000 psi
300 BLK: 125 gr.@2200 fps = 1343 ft.-lbs.; max pres (per SAAMI) is 55,000 psi
5.56x45 (16" barrel): 55 gr.@3000 fps = 1100 ft.-lbs.; max pres (per SAAMI) is 55,000 psi

You sure you really believe that the 300 BLK is more similar to a pistol than a rifle cartridge??? Seems like it is a lot closer to the 5.56, but maybe the 5.56 is just another pistol cartridge too.

[DucatiRon]

Compare apples to apples.

357 Max not Mag.

125 grain 1850 fps and 40,000 psi.

Hornady 10 th edition lists max charge for a 125 300 Blk at 2000 for most loads and 2100 for 2 listed powders.

Shit the venerable 30-30 can kick its ass.

Still not fast enough or powerful enough to be considered a rifle cartridge.

Hell I can send a 200 grain pill out of my 460 at 2250 and it sure as hell isn't a rifle cartridge.

300 AAC Blackout was Saami speced to do one thing. To sell AAC silencers. JDJ never meant the 300 Wisper to be the second comming.

Now if you want to talk 30 Remington. That is a real 30cal rifle cartridge in an Ar-15 platform.

And you forgot to post specs for the 220 sub sonic for comparison.

[wanneroo]

Compare apples to apples.

357 Max not Mag.

125 grain 1850 fps and 40,000 psi.

Hornady 10 th edition lists max charge for a 125 300 Blk at 2000 for most loads and 2100 for 2 listed powders.

Shit the venerable 30-30 can kick its ass.

Still not fast enough or powerful enough to be considered a rifle cartridge.

Hell I can send a 200 grain pill out of my 460 at 2250 and it sure as hell isn't a rifle cartridge.

300 AAC Blackout was Saami speced to do one thing. To sell AAC silencers. JDJ never meant the 300 Wisper to be the second comming.

Now if you want to talk 30 Remington. That is a real 30cal rifle cartridge in an Ar-15 platform.

And you forgot to post specs for the 220 sub sonic for comparison.

Ron, it's a rifle cartridge, not something fired in a revolver or a Glock.

I'm working on a load with 110g Nosler Varmageddons and on my first powder charge already got up 2300 FPS. By the time I am done I'll be on par with any intermediate 30 cal rifle cartridge out there. I put some of these rounds on my steel gong and was damn that hits hard. If you want energy and velocity I think 110g is where it is at. Not 125g.

The 30-30 can kick it's ass, well, who is shooting 30 30 in an AR? I want to shoot a 30 cal immediate cartridge out of a AR and I can do that easily with 300 BO. If want to use 3030 I have to get a lever gun.

Same with 357 Max. The only place I have ever seen 357 Max is in a reloading manual. Who is shooting 357 Max out of an AR?

Whatever 300 Blackout was Saami speced for, it doesn't matter now. Nor does it matter what JDJ wanted or wants. The cartridge is developed way beyond it's original deal and people are taking it in whatever directions they want to go.

[wanneroo]

Just my opinion...

.300BlackOut would only interest me in suppressed situations and 150yds or less.

If choosing between the two, I personally would go with 5.56 because of the availability of spare barrels and ammunition. My AR's only purpose is SHTF and having a firearm that is in common use of the time for compliance to old-school militia duties. ...same reason that I have a Beretta 92FS.

Realistically here in PA with the terrain, if SHTF and Red Dawn happens, would most people end up in a gunfight over 150 yards or under?

[MMH]

357 Max not Mag.

Sorry my mistake. Anytime someone hears 357 they think maximum (not magnum). Sounds like a great cartridge - who makes a gun for that round today?

125 grain 1850 fps and 40,000 psi.

40,000 psi is below what the cartridge was designed for. What is your referance? SAAMI says 55,000 psi. I'll trust them, not you. 1850 fps is a result of YOUR low max pressure.

Hornady 10 th edition lists max charge for a 125 300 Blk at 2000 for most loads and 2100 for 2 listed powders.

Hornady 9th edition lists 2100 fps using 18.8 gr. of H110. I'm getting an average velocity of 2236 fps using a Hornady 125 gr. SST bullet & 18.8 gr. of H110 out of my 16" Sig MCX Gen1. Chronographed with Labradar. Don't care what you believe. I chrono my loads & confirm my velocities with drop at distance(s).

Shit the venerable 30-30 can kick its ass.

Not sure where you are going with this or what comparison you are trying to make. Before you were saying that the 300 BLK is a pistol cartridge and now you are back to comparing it to a rifle. In this context are you considering the venerable 30-30 a pistol or a rifle cartridge?

Still not fast enough or powerful enough to be considered a rifle cartridge.

Actually more powerful (assuming you are referring to KE) than a 5.56. And faster than some rifle cartridges. I have loaded it with 110 gr. GMAX bullets and gotten average velocities of 2460 fps, which exceeds that of a 7.62x39. But then again, as you said, the AK shoots pistol rounds. Not commie bashing here as you accused me of before, just the facts...

Hell I can send a 200 grain pill out of my 460 at 2250 and it sure as hell isn't a rifle cartridge.

Are pills like bullets? Assuming they are, what is your point? That anything slower than 2250 fps shooting a bullet lighter than 200 gr. is not a rifle?

00 AAC Blackout was Saami speced to do one thing. To sell AAC silencers. JDJ never meant the 300 Wisper to be the second comming.

Your thought process is now totally incongruent. You have the SAAMI thing ass backwards - one does not 'spec' SAAMI. SAAMI tells you how the cartridge can be commercially applied. Just because the 300BLK is a good suppressor application does not mean that it was designed with only that in mind. Did you have a religious conversation w/ JDJ? Second coming or not, I don't think that he had failure in mind with the 300 whisper. Focus. Take your ADD meds. Do something...

Now if you want to talk 30 Remington. That is a real 30cal rifle cartridge in an Ar-15 platform.

No I don't. Not familiar with this cartridge. Is it a rifle or pistol round?

And you forgot to post specs for the 220 sub sonic for comparison.

Getting back to the original post, the topic was to compare a 300 BLK to a 5.56. So sure, we can compare to a 5.56 subsonic. Do you want to compare to the 55 gr. or the 75 grain? Either way, the AR15 will not function with either bullet at subsonic velocity & the performance will be dismal, but we can make a ballistic comparison if you like.

[DucatiRon]

The 30-30 can kick it's ass, well, who is shooting 30 30 in an AR?

Same with 357 Max. The only place I have ever seen 357 Max is in a reloading manual. Who is shooting 357 Max out of an AR?

30-30 in an AR-15 is roughly the 30 Remington

357 Max in an Ar-15 was first the 357 Rimless and now the even more useless 350 Legend.


Also forgot to add that your loading 300 blk with pistol powder.

Ghey.