Author
Message
T-800
Offline
Posts: 32
Feedback: 100% (5)
Posted: 10/26/2010 9:31:45 PM
I'm trying to determine which has more ass kick factor for an M203. An M576 round or a shotgun shell adapter.

How many 00 buckshot pellets does the mil-spec M576 contain?
How many 00 are in the standard 3.5" 12 ga. round?

Sketchy internet info indicates (27) 00 pellets for the M576 and (18) 00 pellets for the 3.5" 10 ga. If this is true, it appears the M576 wins.
jestertoo
Member
Offline
Posts: 2752
Feedback: 100% (133)
Link To This Post
Posted: 10/27/2010 10:27:16 AM
Hell no to 3.5" 10ga.

I'd rather load up some low pressure buckshot rounds than fire those beasts.
grog18b
Omnipotent Stomper
Offline
Posts: 361
Feedback: 0% (0)
Link To This Post
Posted: 10/27/2010 8:25:41 PM
[Last Edit: 10/27/2010 8:28:50 PM by grog18b]
Your internet info is wrong.

The M576 does not use OO Buck. It uses #4 buckshot.

There are 20 pellets in the small inner cup that contain the shot.

12 ga adapters work just fine, so do the M576 rounds. Since they contain different shot, your other question is moot.

The 12 ga adapters use a very short "barrel", no longer than 4-5". You don't get a lot of power from that short a barrel, and your shot pattern is pretty wide after a few yards. That's why the 576 was developed. To keep the shot pattern reasonably close at 20-30 yards. The 12ga adapter will not do that.

GROG

"I won't tell you which church to go to, and you don't tell me what kind of firearms I can own..."
T-800
Offline
Posts: 33
Feedback: 100% (5)
Link To This Post
Posted: 10/27/2010 10:46:43 PM
Originally Posted By grog18b:
The M576 does not use OO Buck. It uses #4 buckshot.

There are 20 pellets in the small inner cup that contain the shot.

12 ga adapters work just fine, so do the M576 rounds. Since they contain different shot, your other question is moot.

The 12 ga adapters use a very short "barrel", no longer than 4-5". You don't get a lot of power from that short a barrel, and your shot pattern is pretty wide after a few yards. That's why the 576 was developed. To keep the shot pattern reasonably close at 20-30 yards. The 12ga adapter will not do that.

GROG



Thanks for the input Grog. I was hoping you'de chime in.

Federal Classic 12 ga 3-inch #4 buck contains 41 pellets. This is significantly more than the 20 pellets used by the M576.
However, even though the 12 ga round has double the pellets, it spreads too quickly in the large 40 mm barrel and is therefore less effective than the M576 at 20-30 yards. Is this correct?
Therefore, if ones plans to use buckshot wih his M16, would one be better with an undermounted SBS than an M203??

grog18b
Omnipotent Stomper
Offline
Posts: 362
Feedback: 0% (0)
Link To This Post
Posted: 10/28/2010 12:17:59 PM
However, even though the 12 ga round has double the pellets, it spreads too quickly in the large 40 mm barrel and is therefore less effective than the M576 at 20-30 yards. Is this correct?

Yes. The shot from the M576 carrier is not released until it exits the 40mm barrel and the carrier slows enough from air resistance to rfelease them. The shot pattern will hold tight until that happens. When fired from an adapter with a length of 5", a 12ga OO buck will start spreading when it is released from the adapter, after 5" of travel.
Therefore, if ones plans to use buckshot wih his M16, would one be better with an undermounted SBS than an M203??

If you want to add the ability to launch shotgun payloads to the M16 platform, a "Masterkey" mount serves this purpose better than an M203. (You can carry FAR more 12ga rounds than you can carry M576 rounds, plus the cost is much cheaper!) To get the effectiveness of the shotgun, you need a longer barrel than an adapter. There are actually two ways you can do this. First is the Masterkey mount for an 870 type shotgun. Second is this:
Nick Ferris Adapter
This adapter transforms your 40mm barrel to a 20ga shotgun barrel (rifled for slugs). You can then shoot 20ga standard shotshells, including buckshot, slugs, and the exploding practice pictured on the site.

As far as weaponry goes, a shotgun is meant to fire shotgun shells, the M203 is meant to fire 40mm grenades. When you take ammo from one weapon system, and use an adapter to fire it in another, there is a trade off. Especially with shotgun shells in a 40mm with adapter. Imagine the difference between your standard length 12ga 870, and a sawed off 5" barrel single shot 12ga. For short range "oh crap" shots, the adapter will work fine. So will the 12ga. For the medium range shots... the adapter will not work so well. The shotgun will.

GROG


"I won't tell you which church to go to, and you don't tell me what kind of firearms I can own..."
Quake_Guy
Offline
Posts: 1263
Feedback: 100% (13)
Link To This Post
Posted: 11/5/2010 11:06:45 AM
wow, only 20 pellets of #4 buck in a 40mm round, surprised. I thought it was this massive shotgun round.
Combat_Diver
Team Member
Offline
Posts: 3613
Feedback: 100% (39)
Link To This Post
Posted: 2/19/2011 6:25:43 AM
I forgot the nomenclature for the 40mm buckshot round but I was understanding it to have 9 pellets of 00, same as a standard 12ga round.

CD
De Oppresso Liber
Iraq: 91,03,04,05,06,08,09'
Afganistan: 09,10,11'
Cromlech
Josama Bin Eating
Offline
Posts: 4167
Feedback: 0% (0)
Link To This Post
Posted: 2/19/2011 10:39:59 AM
This would sting a bit:

XM1001 40MM CANISTER CARTRIDGE





When in deadly danger, when beset by doubt,
run in little circles, wave your arms and shout.
T-800
Member
Offline
Posts: 97
Feedback: 100% (5)
Link To This Post
Posted: 2/19/2011 3:47:40 PM
Originally Posted By Cromlech:
This would sting a bit:

XM1001 40MM CANISTER CARTRIDGE





I like.
Where can I order some?
Quake_Guy
Offline
Posts: 1422
Feedback: 100% (13)
Link To This Post
Posted: 3/7/2011 8:13:39 PM
so the beehive adapters are substantially more lethal than the 40mm shotgun round?
mike12345
Offline
Posts: 3182
Feedback: 100% (47)
Link To This Post
Posted: 4/10/2011 7:50:38 PM
the xm1001 is a mk19 rd, the M203 just dosent have the velocity.

i dont know how well that would work because people woul aim too high. The other problem is how the flechettes seperate from the canister.