• Ballistics Theory And Design Of Guns And Ammunition Rare

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Let’s start off with a question: What is At the Big 3 East conference this week, a new caliber was unveiled for the AR-15., it is based on the.30 Remington/, necked down to.22 caliber, giving it similar internal and external geometry to, released at SHOT Show this year. However, as we’ll see the Valkyrie really is a different horse, and could re-write the landscape of alternative rounds for the AR-15. My interest in the.224 Valkyrie was pretty immediate, because it was an obviously good design in a way that the.22 Nosler is not. Where the Nosler was designed for case capacity over everything else, the Valkyrie couples a good case with ample space for a slender projectile ogive. This design was the secret “sauce” behind the 6.5 Grendel, 5.45×39, 6.5×55, and many other successful high performance rifle rounds. The Valkyrie was going to have good performance, I knew, because I’d been toying with the same concept for years:, plenty of ogive space, with a.22 caliber projectile in a format that works in the AR-15. I guess there’s no point in keeping these secret anymore Although Federal has not released its spec sheet yet, the.224 Valkyrie appears to have a case that is about 1.62″ long, with an 0.240″ long neck.

The shoulder is almost certainly 30 degrees (as is popular at the moment), and the case taper is probably similar to.308 at about 0.35 degrees per side. Since I already had a 6.8 SPC case model laying around, this made modeling the.224 Valkyrie in SolidWorks pretty straightforward: This case model has a capacity of 34.5 grs H2O (2.23 ccs), which is just a bit short of the.22 Nosler’s 35.8 grains (2.32 ccs) or so. The case model’s weight is 6.92 grams. This means, with a 90gr bullet and a 29.6 gr powder charge, the.224 Valkyrie is clocking in at right about 14.9 grams in weight.

This is definitely on the lighter end of the scale for AR rounds, thanks mostly to the heavier projectile. Obviously, the Valkyrie competes directly with and.22 Nosler in the.22 cal AR-15 rifle cartridge bracket, but, well, the ballistics really tell the whole story here: Well then, that sure seems definitive, doesn’t it? The.224 Valkyrie has 5.56mm Mk.

262 beat for velocity by 200 meters; the.22 Nosler it has whupped by 250 meters, and all with a bullet that’s 17% heavier. In terms of muzzle energy, it leads the pack of.22s to start, but clings bitterly to every Joule to such a degree that by a kilometer it’s even nipping at the heels of the much-touted 6.5 Grendel. Yet, where the Grendel disappoints in drop and drift, the Valkyrie pulls ahead, earning a massive lead in drop and drift over everything on the chart by the time kilobuck range rolls around. (In fact, although not included on the chart, the.224 Valkyrie approaches in both respects at this range). So, wait, the.224 Valkyrie is an AR-15 compatible round that gives you.22 Nosler performance up close, 6.5 Grendel energy retention, and 6.5 Creedmoor drop and drift at 1,000m? Well, these are just estimates, but Yeah, looks that way. Now, all they need to do is make a direct impingement SASS rifle in the Valkyrie that uses the Magpul Six8 PMags for that full, glorious 2.3″ OAL.

Then we’ll really be cooking with gas. And, hey, Federal? DON’T CHANGE THE NAME!!! Comparing a 90 Bergerish VLD against three legacy SMKs isn’t really a fair comparison, is it? The details from the first article were sparse but they said it would “stabilize to 1000yds” and MV was 2700fps.

Even a 90 SMK would stabilize at 1k that MV and it’s possible that’s what Federal is loading (hopefully not). A much fairer test here would be to compare the 22 Nosler using a Nosler 70 RDF, which is an actual VLD.

That and a 130 Berger 6.5 Creedmoor. You’d probably be getting much closer to hair-splitting territory in that case. But the kicker is as you say, that the 224Valk has room to accept longer and longer VLDs. So I agree with your overall analysis. I’ve been saying for years here that 224 needs some VLD love and that 224AR was the best thing going. The 22 Beast and 22 Nosler got it wrong. This gets it right, and hopefully will catch on in a way that 224AR didn’t.

If we see some 6.8 Scandinavian brass then the 224Valk may just be a winner. It is indeed a little bit of a trade-off with the proprietary upper receiver and bolt carrier on the ANVIL upper, the bolt also uses a proprietary lug geometry matched up with its barrel extension.

But, in fact, you can simply exchange that bolt/extension combo for any SR-25 compatible bolt and extension. A new barrel chambered in your.458 SOCOM based wildcat using an SR-25 standardized.308 bolt and barrel extension would slot right into the MkW ANVIL. Other than the bolt carrier and upper receiver itself, the other parts are all very modular and exchangeable with other manufacturers’ products. An armchair benchrester in me cannot fully agree with comparison. Pitting a cartridge with latest, hottest 90gr VLD (0.283 G7? Someone handle Berger guys some tissues!) against designs using older bullets does not feel 100% right. There are 75gr Bergers with 0.216 G7, though 123gr 6.5 SMK is probably a pinnacle along with Scenar.

However, I should admit I don’t know if those newer 75gr could be loaded into AR-15-compatible 5.56×45. Some 90-grainers surely could not. Otherwise, quite impressive ballistics – as expected from a case with more powder and sleeker bullet. Can’t argue it still compares favourably with 77gr.223 (according to JBM there won’t be no significant difference in drop out to 500m, but energy retention and drift are predictably superb). The fun part is that Grendel’s trajectory becomes closer, but still won’t beat the newcomer!

Maybe new 6.5mm 12x grainers, with better BC will appear (and be short enough to fit into “AR Grendel”), but for now the round appears plateaued. I do wish to note that, should someone manage to load 75gr Bergers into AR-compatible.223 with that 2850 fps muzzle velocity, it won’t be bad round at all. Drop is dead-on with “original” Valkyrie (with that godly 0.283 G7 bullet) out to 600m.

I’d go out on a limb and call wind drift “acceptable” (have no idea what kind of shot pattern a grunt shooting mass-produced rifle at 500+m will produce, but my guess that there won’t be 0.25 MOA cloverleafs). Those are grumbles, of course. New round do seem to hit a sweet spot. All perks of heavier bullet for just 10% increase in recoil impulse over 77gr.223, compared to Grendel which is worse than x39 in this regard.

The answer disappeared 3times now at the other article. I now just write here. Thy projectile has 820y stability with 120mm, over that it gets highly unstable and starts to tumble getting extremly inaccurate and loosing its energy. 725y at bad weather. It has 83ftlbf at 820y/ at bad weather 83ftlbf at 725.

Increasing size, will reduce velocity when using same muzzle energy, reduces required twist, all decreasing force on the jacked, and increasing G7BC, which overall can lead to a better fragmentation range. My 6.5 Grendel AR is only about half built.

I picked up an 18″ fluted HBAR barrel a few months ago and just picked up a BCG and an Anderson upper to assemble it on. I regret nothing (so far). 6.5 Grendel still seems like a good way to go. A lot of states require.24 caliber for hunting large game.

Mine is 1200ft-lbs, so my 20″.223 Wylde AR is just fine with hotter loads (I roll 75gr Speer Gold dots, though yet to take a deer with the rifle). Still, I wanted something a little higher powered and a bit larger diameter for deer hunting. Also covers the long range shooting. Plenty of options on reloading.

Steel cased for some cheap range sessions. Howa Barreled action 22″ rifle as an option to complement the AR for a bolt action longer range rifle for bench shooting or when I want to look less tacticool hunting. Someday I am sure I’ll have a million calibers crowding my shelves and complicating reloading. As it stands I’ve got.223/5.56 and.308/7.62. Adding 6.5 Grendel makes it 3 total. At some point I’ll get an M1 Garand and probably get something in.30-06 in a bolt action.

Maybe I am a fuddy-duddy, but more than 4 cartridges to load for and keep around just seems too much. For rifles of course.

Correct me if I’m wrong, but if this cartridge won’t fit a regular AR-15 magazine, or fits but is not feeding reliably, technically it’s not an AR-15 cartridge, right? I know, it sounds like I’m just trying to knitpick on trivial stuff, but I’m serious. If it doesn’t fit an AR mag and you have to design a new rifle for it (like the Six8 from LWRC), who’s going to use it? All these wonder cartridges come and go while ubiquitous calibers with slightly crappy performance and/or substantial disadvantages are here to stay:.45-70, 30-30, 9mm, 5.56 and so on. I know there’s a lot to this when it comes to military cartridges, but from a commercial standpoint, it’s really simple: stuff that’s versatile, available and doesn’t need a new magazine, new rifle, new this and that will stick. It’s that simple. That’s the reason why the 300 BLK stuck as well: versatile, doesn’t need a new mag, doesn’t even need a new bolt, just a barrel.

It is easy to load, easy to form brass for from bog standard.223 cases, easy to get bullets for. Definitely not. Wonder round? But it gives you what it promises and it does this while being fairly accessible for the civilian shooter. The same goes for 6.5CM. Versatile, doesn’t need a proprietary mag or other stuff and again, easy to reload from existing components. Even with monstrosities like the.458 SOCOM the same logic can be applied.

And it stuck, while stuff like the.512 Beck and other three day marvels went the way of the dodo. With these factors in mind it’s basically a dead giveaway of failure when a new cartridge comes out for ARs that won’t fit existing mags and needs a new receiver or such, doesn’t matter how good it is.

It’s always like this. I’ve been waiting forever to see someone get a 90gr.224 bullet in a magazine fed package.

I’ve always thought that if you could get that bullet going 2700-3000fps in a reasonably sized catridge that will reliably feed in an AR/semi-auto, that that would be a great contender for an ideal standard issue cartridge(not considering the problems of switching calibers for a military, especially one as large as the U.S. I have long felt that the 762 by 45 would be an ideal case to base assault rifle cartridge on. With good bullets the original wouldn’t be too bad I would suspect. As with many other Concepts the limiter is the Too Short case length magazine length of the AR-15.

If they had made it a quarter inch longer we would have far more options. They might have even been able to meet the actual projections from the sub caliber High Velocity program.

Not use a poorly shaped bullet that didn’t go as fast as it was supposed to.

Ballistics Theory And Design Of Guns And Ammunition Rare

The entire contents of the explosives folder of the FTP is now available as a single rar file. Over 1.6 GB of data (compressed) and about 230 different files altogether. This includes books, journals, and videos. There are some text files, some websites, but no anarchist crapbook stuff. I would list all the good, but that can wait for another day. From the nfo: Over the last few years an increasing wealth of technical information has found its way to the Internet. Information about explosives, though, is quite rare.

The industrious members of www.roguesci.org have scoured the web, and in most cases fired up their scanners, to compile the single greatest collection of books, journals, and videos relating to explosives. Nowhere else can you find such a vast collection of scientific information in a single place, and no one else but www.roguesci.org would give it all away for free. What you will not find in this release is the usual worthless crap like anarchist or terrorist manuals.

All of these files are professionally published books and journal articles. Various titles include The Encyclopedia of Explosives and Related Items vol 1-10, Urbanski’s Chemistry and Technology of Explosives vol 1-4, Davis’s Chemistry of Powder and Explosives, Fordham’s High Explosives and Propellants, and over 230 other titles. Get the torrent here: Science Explosives Book Collection 1.0.rar.torrent edit: fixed link. 'Each time the RAR will not open'? When downloading RAR archives, I find that the problem causing this is usually in the last 10 or less bytes of the file. This can be easily fixed using the 'repair archive' feature of WinRAR 3.3, which is available by starting WinRAR from its executable file (as distinct from clicking in a WinRAR archive) and then selecting the file to be repaired, and selecting 'repair archive'. This process would take several minutes for a 1.6 Gb archive, during which time WinRAR may appear to be halted.

WinRAR can also repair ZIP archives.