Mega Rad Gun Thread

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Barrel length arguments are retarded. Good defensive ammo will still upset at 1900fps. A socom 10.3" will have a mk262 round going that fast out to 300m, further than anyone is going to be reliably making first round impacts on the 2 way range.
 
Gentle_Brick said:
Barrel length arguments are retarded. Good defensive ammo will still upset at 1900fps. A socom 10.3" will have a mk262 round going that fast out to 300m, further than anyone is going to be reliably making first round impacts on the 2 way range.
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It is retarded when we are talking about it from an individual users persepective outside the 1%.

It's not retarded for the pencil pushers in the military though. Same goes for reliability.
 
Foley said:
It is retarded when we are talking about it from an individual users persepective outside the 1%.

It's not retarded for the pencil pushers in the military though. Same goes for reliability.
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Sure, a 0.5% increase in probably matters when you talk that scale, but people itt don't seem to get the idea of decision making for an institution vs the individual.
 
Muskie said:
If they make the chamber longer like 38/357 guns you will encounter the same problem those guns have. Shooting a lot of the shorter cartridge will build up carbon at the far end of the chambers and cause jams with the longer ammo.
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I'm kinda hoping that if this procurement request advances, we'll get some kind of standardized quick-change barrel upper for the AR platform to accommodate the dual-ammo request which would be kinda dope.
 
Ill said:
I don't think it will fit in a standard chamber, isn't the request to replace the entire upper?
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The upper is getting replaced so it can be beefed up a bit to withstand the pressures.

The barrel and especially the barrel throat have to be able to handle 80k+ psi 5.56mm loads from the new superhot rounds.

It's fit right onto a factory M4A1 lower so it's using the standard carbine buffer length.

The new rounds should be dimensionally identical to M855/A1 or Mk 262. It's just a LOT hotter.

"Primary Attributes:

HICAR shall be chambered in 5.56x45mm NATO. (T=O)
HICAR shall be compatible and capable of fit and functioning with the M4A1 lower receiver group without permanent modifications (T); with zero modifications (O)
HICAR shall fire and function with M855A1, Mk262 as well as Government supplied M855A1+ hypervelocity ammunition loaded to 82kpsi (T); with future hypervelocity ammunition designs optimized for projectile velocity and terminal effects on target (O). "
 
Falcos_Commisar said:
The upper is getting replaced so it can be beefed up a bit to withstand the pressures.

The barrel and especially the barrel throat have to be able to handle 80k+ psi 5.56mm loads from the new superhot rounds.

It's fit right onto a factory M4A1 lower so it's using the standard carbine buffer length.

The new rounds should be dimensionally identical to M855/A1 or Mk 262. It's just a LOT hotter.

"Primary Attributes:

HICAR shall be chambered in 5.56x45mm NATO. (T=O)
HICAR shall be compatible and capable of fit and functioning with the M4A1 lower receiver group without permanent modifications (T); with zero modifications (O)
HICAR shall fire and function with M855A1, Mk262 as well as Government supplied M855A1+ hypervelocity ammunition loaded to 82kpsi (T); with future hypervelocity ammunition designs optimized for projectile velocity and terminal effects on target (O). "
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They're probably going to get the nas3 cases. The claims are a little overhyped, hunting guys have jumped all over those already, the velocity gains are good, but fall short of the hype from the mfg.
 
Gentle_Brick said:
They're probably going to get the nas3 cases. The claims are a little overhyped, hunting guys have jumped all over those already, the velocity gains are good, but fall short of the hype from the mfg.
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I have extremely little experience with those but I did find 3 in .308 on the ground. All had a big gap between the head and body on one side, presumably from being grabbed and ripped in an AR10. I do see mega extractor marks/rim bending on some brass from over gassed AR10s but I'd hope they really get shit ironed out and stick the parts together better. I think this was an issue with the brass/steel 6.8 ammo too where case head separations weren't uncommon.

As far as hunting stuff most of the boost you're getting would just be from the gained volume due to thinner walls, letting you pack more powder in for a "longer push". Bumping pressure which is then allowed by the case head not extruding or spitting out primers gets you a lot more, and when both pressure and capacity gains are combined you're doing great. The brass/steel 6.8 only gets you pressure and may even lose you volume so if that were done in NAS3 the speeds would be even better for the same pressure or you could achieve the same speeds with less pressure, all while dropping probably a couple pounds from case weight
 
Gentle_Brick said:
They're probably going to get the nas3 cases. The claims are a little overhyped, hunting guys have jumped all over those already, the velocity gains are good, but fall short of the hype from the mfg.
Click to expand...

SHIGGSHOGG said:
I have extremely little experience with those but I did find 3 in .308 on the ground. All had a big gap between the head and body on one side, presumably from being grabbed and ripped in an AR10. I do see mega extractor marks/rim bending on some brass from over gassed AR10s but I'd hope they really get shit ironed out and stick the parts together better. I think this was an issue with the brass/steel 6.8 ammo too where case head separations weren't uncommon.

As far as hunting stuff most of the boost you're getting would just be from the gained volume due to thinner walls, letting you pack more powder in for a "longer push". Bumping pressure which is then allowed by the case head not extruding or spitting out primers gets you a lot more, and when both pressure and capacity gains are combined you're doing great. The brass/steel 6.8 only gets you pressure and may even lose you volume so if that were done in NAS3 the speeds would be even better for the same pressure or you could achieve the same speeds with less pressure, all while dropping probably a couple pounds from case weight
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Both of the major ammo companies, Kinetic Group and Winchester, have experience making high pressure ammo. Kinetic group from 7mm Backcountry and Winchester from winning the bid to build the new 6.8 factory at Lake City. I would not be surprised if one or both of them have a case design done or close to done. The trick is going to be figuring out a way to make the SS heads without having to turn them. Economies of scale say that turning the head is not viable compared to a forming operation like cold heading. I know the Sig round is still having the head turned. Haven’t seen any of the NAS3 or 7mm Backcountry stuff to know how they are manufacturing them.
 
Smoke Manmuscle said:
7mm Backcountry
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That was a worse non-cartridge than .224 Valkyrie, I completely forgot about it.
In fact there's a lot of wunderboolits that haven't been doing well like .350 Legend, .300 HAM'R, .400 Legend, .400 HAM'R, .360 Buckhammer, 6mm Creedmore, 6.8 Western, .277 Fury...
 
WhoBusTank69 said:
That was a worse non-cartridge than .224 Valkyrie, I completely forgot about it.
In fact there's a lot of wunderboolits that haven't been doing well like .350 Legend, .300 HAM'R, .400 Legend, .400 HAM'R, .360 Buckhammer, 6mm Creedmore, 6.8 Western, .277 Fury...
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I’d agree on with you on everything except .350 Legend. With the rule changes on straight wall hunting in Midwest states it has become the go to for a lot of deer hunters.
 
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