survivalshop

So you don't think they will build a limited production car similar to the one shown ? Why not & how do you know there isn't one in the works ?

AMMUNITION, AR-15, RELOADING, RELOADING CORNER, RIFLES RELOADERS CORNER: CARTRIDGE EVOLUTION NOVEMBER 15, 2018 GLEN ZEDIKER7 COMMENTS Here’s a short retrospect on what’s set the standards for most new cartridge designs, and why… KEEP READING Glen Zediker I’m not an engineer, but, like all of us, we rely on those folks to develop just about all the things we have and use. When we look at a new development, one that’s proven to work better than the “old” way, sometimes it’s easy enough to understand why. Cartridge development over the years is a good example. What makes a good cartridge? Answers, of course, vary with the intended use, the performance needs. For the most part, power (which mostly is velocity), and “efficiency” (which is essentially getting the most from the least amount of propellant, likewise increasing barrel life), and accuracy (always) top the list. And, to me, “accuracy” is a combination of small group sizes and, even more, small group sizes all the time! Consistency. Case capacity has the most to do with the first: more room for gunpowder means more power. Also, it’s pretty clear that pressures have been going up! There’s a big (big) difference in the pressure levels of some of the “new” cartridges compared to the older, longer-lived rounds. Sometimes it’s not because the older round can’t “take” the additional pressure, it’s because the guns might not. A round developed turn-of-the-century fits a rifle from the same era. Well, steel has improved, manufacturing has improved, and, some no doubt, is that the trend toward “shorter, fatter” cartridge cases also contributes. So. About that… In my mind, and certainly in my “world,” which is competitive shooting, one of the most influential cartridges has been, and still is, the PPC. That was developed in 1975 by Ferris Pendell and Dr. Lou Palmisano (hence “Pendell, Palmisano Cartridge”), and the idea was to design the “world’s most accurate cartridge.” They did. It has the record to prove it. However, that’s in Benchrest (capital “B” meaning formal competition). Bechrest is nearly always a 100-yard event. The idea behind the PPC wasn’t to set the range on fire with excessive velocity, although it’s well more rapid than others then popular in that game. The idea was to improve cartridge structure to improve shot-to-shot consistency, and another part of that plan was to extend the duration of load-to-load consistency by slowing down firing-induced changes to the case. It’s native caliber is 6mm (.243). (By the way, the PPC is based on .220 Russian, which is still how many get their brass: fire form it from that. That round is associated with 7.62X39mm, which came earlier and was based on the WWII German 7.92x33mm Kurz, the Mittelpatrone.) PPC isn’t for everyone. It’s expensive and not nearly the fastest available today. However, it sho has had its influence on modern rounds. It’s expensive, by the way, because of the available brass: it’s from Lapua or Norma and has machined primer pockets, and other such points of perfection. Compared to .223 Rem. (right) which, in configuration, follows pretty well accepted architecture, similar to .30-06 and other originally-mil-based rounds, the PPC is shorter, larger-diameter, and longer-necked. A few reasons, offered by its creators, why PPC shoots so well: One, it’s a short case, a scant 1.515 inches overall. That makes it more rigid and less susceptible to warp. It also means it fits into a short action, also more rigid (and with shorter bolt travel). The case neck is relatively long, which means the entire shank of the bullet is within the neck, never below it. That means no influence from varying cartridge wall thicknesses (the case neck walls can be made near-perfectly consistent), avoiding the case neck “donut” at the neck, shoulder juncture. Its body area diameter is 0.440-vicinity, which is (was) a good deal larger than the more common 0.378 commonly used in Benchrest. Case shoulder is 30-degrees. About that: Well before the PPC there was P.O. Ackley. Well-known for his “Ackley Improved” rounds, which, pretty much, were standard rounds with a sharper shoulder angle. In sharpening (flattening) the shoulder angle (usually from 23-degrees to 30 or even 40), that also elevated the shoulder, and that increased case volume. More speed! Another benefit of the sharper shoulder was a notable reduction in the “flow” of the brass. That meant less change firing to firing. The sharper angle on the shoulder essentially “caps” the flow in that area. Dang. These always look so radical, but it’s a proven formula: the Ackley Improved. My Dad used one of these in .270 decades ago (P.O hisseff built his rifle) for elk hunting. Shown is an AI 280 Rem. which nearly equals the power of 7mm Magnum. Other attributes engineered into the PPC have and haven’t been incorporated into subsequent new cartridges. Notable is the smaller-than-standard flash hole. This requires a likewise smaller sizing die decapping pin. Also, PPC uses a small rifle primer, which is fitting based on its overall round size. Over years, there have been retro-engineered common rounds with small primer pockets and those have worked well. For a spell, over the time it was available, small-primer .308 Win. brass found great favor among competitive shooters. Remington made it. Interestingly (again from a perspective of one who isn’t an engineer) pressures were higher compared to standard loads based on routine large-primer brass. Velocities tended to be more consistent. Another reason for PPC perfomance is one I don’t pretend to understand, and that is its “efficiency.” That’s all in the science of internal ballistics and I only can attest to its influence. I have been a PPC user (the 22 variant) for a good while. It’s what my main NRA High Power Match Rifle is chambered in (AR15 platform). From virtually the same amount of the same propellant, there’s a solid +100 fps gain over the .223 Rem. The structure of the PPC indeed “works.” From that, and from “those” (High Power shooters), rapidly evolved experimental takes on the essential PPC. Moving on, rounds like 6BR and 6.5 Grendel are outgrowths of the PPC format (“upgrowths” actually: they’re bigger capacity). We’ve also seen the essential influence in the popular 6.5 Creedmoor and the 6XC, which currently dominate competitive across-the-course and long-range shooting (“standard” long range, not the 2-mile stuff, that would be .375 Cheytak…). Cuzzin to PPC is 6.5 Grendel (left), which grew from earlier experiments by NRA High Power Rifle shooters in creating PPC “tall-boys.” Looking at semi-auto developments, many of which have been coming at us fast and furious, it’s clear cartridge developers are exploiting these same ideas. There is a (short) limit on what will fit into an AR15 upper receiver, for instance, because, one, it’s a finite amount of space, of course, and, two, there’s a magazine box, and these are related. More power in this platform means a fat case. Now. I am in no way suggesting anyone run out and tool up for PPC in the next rifle! It can be soundly beaten in the “real world” of our needs from a cartridge. There are similar rounds with more velocity, easier availability, lower cost, and on down the list of desirables. In the next couple of issues, I plan to talk more about some of the newest rounds, but wanted to offer just a little retrospect on where it all came from before getting into where it’s gone! This article was adapted from content in Glen’s newest book: America’s Gun: The Practical AR15. Go check it out HERE! Glen’s books, Handloading For Competition and Top-Grade Ammo, are available at Midsouth HERE. For more information about other books by Glen, visit ZedikerPublishing.com Check out AckleyImproved.com

I always wanted a Charger in that year range . That car is a custom concept , so hopefully the production one will not have those chintzy fender flairs .

Ted Brown is one of the best M14 Smiths out there . I have to order some Brown Carbon Fiber to make a HG for this one . I'm in the process of making new molds for the HG's , my experimental ones are pretty beat up . I still need a few Parts , the two biggest are the Op Rod & Gas Cylinder .

It's just what i needed , a Bolt Action Pistol -------------------------------------- Not !

All Barrels need break in time for them to season up properly , even some Match Barrels . You don't say much about the Rifle , is it new ? Scoped ? If so , what Scope ,Mount /Rings ? What ammo ? have you tried other Brands & Bullet weights of ammo ?

Just saying HS is measured from the Bolt Face to the SAAMI Shoulder datum point is enough . The fitment of the Barrels Extension is Critical for proper Function & HS .Sketch is a little crude , but shows it's just not as easy to adj. HS by trimming the Barrels Extension . The relationship of all the Action components are critical , as has been said , it's a domino effect , if you start changing the dimensions/spec's of one of them.

Wife purchased me a USGI Rear Sight for my Birthday , getting closer to range day .

Solvents like Acetone may help next time , there are others .

We also don't know what happened before the video we have seen We always get part of the full story , just like the LE shootings , we only get part of the picture .

I have one of those for my S&W Shield & when I carried it , it was comfortable & easy to draw . I carry my P320C now in a Kydex holster & I have got used to it .

This topic comes up on just about all Gun Forums & its not how long you can go with out cleaning & lubricating Firearms , its what kind of service life you want out of them & their Components & Parts . Lack of cleaning & Lubrication will undoubtedly reduct service life of Parts . That Lubricant from 98 is some of the best lubricant I have ever used .

The Snowmobiler could have waited a bit , I think he pushed the animal too , but what I wonder is , did someone go back for the meat or to check to make sure the animal was not just wounded ?

. For the history buffs. Some of our fathers were involved Some very interesting World War II Facts. Many you would not believe or were even aware of. The first German serviceman killed in the war was killed by the Japanese. Over 100,000 Allied bomber crewmen were killed over Europe. More U.S. Servicemen died in the Air Corps than the Marine Corps. Polish Catholic midwife Stanisawa Leszczyñska delivered 3,000 babies at the Auschwitz Concentration camp during the Holocaust in occupied Poland. In World War II, British soldiers got a ration of three sheets of toilet paper a day. Americans got 22. In 1941, more than three million cars were manufactured in the United States. Only 139 more were made during the entire war. Four of every five German soldiers killed in the war died on the Eastern Front. Only 20 percent of the males born in the Soviet Union in 1923 survived the war. In World War II, the youngest serviceman in the United States military was Calvin Graham - age 12. Graham lied about his age when he enlisted in the US Navy. His real age was not discovered until after he was wounded. (Unbelievable) Only one out of every four men serving on U-boats survived. The Siege of Stalingrad resulted in more Russian deaths (military and civilian) Than the United States and Britain sustained (combined) in all of World War II. To avoid using the German sounding name 'hamburger' during World War II, Americans Used the name 'Liberty Steak.' Adolf Hitler's nephew, William Hitler, served in the US Navy during World War II!!! Adolph Hitler and Henry Ford each kept a framed picture of the other on his desk. During World War II, the largest Japanese spy ring was actually located in Mexico. The mortality rate for Russian POWs in German camps was 85 percent. Had it been necessary for a third atom bomb, the city targeted would have been Tokyo. An Imperial Japanese Army intelligence officer, who fought in World War II, Hiroo Onoda never surrendered in 1945. Until 1974, for almost 30 years, he held his position in the Philippines. His former commander traveled from Japan to personally issue orders relieving him from duty in 1974. Total casualties for World War II totaled between 50 - 70 million people, 80 percent of which came from only four countries - Russia, China, Germany and Poland. Over 50 percent of the casualties were civilians, with the majority of those being women and children. Veterans are people who, at one point in their lives, wrote a blank check payable to the United States Of America, for an amount up to and including their lives. Remember ALL of our Vets.. FREE Animations for your email by IncrediMail Click Here!

Is there a difference in Barrel extensions for an Armalite AR 10 & a DPMS LR 308 ?

ya witness accounts are all over the place on weapons used . Let's see if we can get some truth for a change , I'm not holding my breath . Hard to be a Country Music fan now a days .

I'm already on Beans & Franks ! ?

It sucks to have more needs & wants , but not enough money to get them all .?

The Barrel & Upper Receiver are really the Heart of the Rifles potential accuracy , they have to be as one for consistency & yes there are a list of things or components /parts that have to come together for superior accuracy , but it really boils down to the nut behind the Trigger, if all else is up to the task .

Are you purposely trying to keep me from finishing my M14 Build , my $$ can only go so far .?

Damn , you can buy a whole car for that much ! ( a Kia) ?

& this thread was doing so well .?

I have three bare lowers , it will have a home , since I just talked my wife into purchasing the M14 Rear Sight for me for Christmas , I'm not losing anything toward the M14 Build .?

Wonder what he has to pay for that Engine ? Just the Engine .

Cain Tip for storage in the Safe , that's a good one .