below 1 standard deviation (<.005″) 1.735″, within 1 standard deviation (.005″-.010″) of 2.016″, and over one standard deviation of 2.237″! This round features a 230 grain jacketed hollow point bullet in a brass case. This being said, factory ammo clocking a bit slower than advertised is nothing new, although this has been a lot better since the broad availability of affordable chronos ... standard deviation (s.d.) Name for Calculation. The results are shown as a range based on the standard deviation of assumed independent measurements for the factory ammunition. On the whole, the new crop of ammo brought the overall averages higher in Standard Deviation (thats bad), Extreme Spread (bad), average group … The ammo’s Standard Deviation (SD) is unknown. The bigger the runout gets, the bigger the groups. As general rules of thumb, ammunition that performs at or less than 50 feet per second (fps) ES is pretty good ammunition. .380 Auto – 100 grain 50 round box – $18.99 Velocities: 960 Test Barrel Length 3.25″ G43 Avg. Here’s how my loads compared to Tul-Ammo 122 grain steel-cased factory ammo: HandLoads: Tul-Ammo: Bullet Weight: 123 grains: 122 grains: Velocity: 2339: 2374: Standard Deviation: 17 fps: 48 fps: The velocity from the handloads was 98.5% that of the factory ammunition, where the charge weight was 96.1% of max. Therefore, the better measure of consistency is standard deviation. Trusted by avid competitors for it’s consistency and accuracy, this round is popular among competitors, tactical training enthusiasts and the everyday shooter alike. For factory ammo, these types of numbers are very consistent and show the time and quality HSM puts into loading this ammunition. If I let the default powder measure on the Dillion 550 do the powder charges I sometimes get up to 30 fps. These are the same components I’ve had success with for years. Ammunition that shoots under 35 fps ES is really good ammunition. 84.4%. I crimped some, and compared it to ammo from the same box that was still belled from the factory. 50.4%. Of the three bullets, I really wanted the bonded controlled expansion Scirocco, but I needed to pick the bullet that would perform the same every time I fired the gun. The smaller the standard deviation value the more consistent the load, which results in better accuracy. Having ammo with low SD values would logically reduce shot to shot velocity differences that would affect long range performance. A standard deviation value of 10 or less is considered excellent for ammunition, and factory ammo often reads way below this value. I ran a 15-shot string through my Oehler 35P chronograph. I found the No significant difference in velocity, velocity spread or standard deviation. Moderators: flatgate, Moderators. This seems to provide support to the theory that ammunition concentricity does in fact affect group size. ... Our factory is located in the city of Uzice in southwestern Serbia. Also, the standard deviation seems to be lower with the crimped ammo. Muzzle Velocity 960 Standard Deviation 3.8 Accuracy: For one thing, that A-Bolt proved to have a "slow barrel," and not just because of the 22-inch length rather than the standard 24-inch test barrel. As shooters, we know ammunition must also be accurate and reliable! In a sample of 16 ammo magazines, the sample average was found. Which is comparable to hand loaded ammunition. Black Dot Ammunition is a family owned and operated, federally licensed ammunition manufacturer, based in Crawford, Alabama. Sometimes as high as 40+. Same with chronograph readings, while consistency of weight was near the top, in third place. When I load match ammo for bullseye competition I work for an SD of 4 or less. I chronoed 20 round strings at a power factor of 131.6 consistently, which is conistent with a friends data. We often use standard deviation (SD) to describe how consistent our muzzle velocities are. I’ll try to not nerd out on you guys, but let me explain SD the quickest way I can. Standard deviation quantifies the variation in a set of data. The standard deviation(aka “SD”) is The 92-year-old .300 Savage is the archetypal short-action cartridge. Got my RPR and tried 5 boxes of varying ammo. Using a 220-grain Sierra HPBT bullet, average velocities measured 929 fps. Because of the demand, a huge leap in long-range ammunition has developed. As tested, a standard deviation of 12 indicated very consistent pressures. We have been shooting long range for over 24 years! Like all of my field tests, I was determined to objectively measure and test everything I could. Nexus Ammunition’s Match line of ammo is designed to exceed the expectations of the most discerning customers. Most factory ammo has MUCH higher SD's. Either of the loads you list should work, provided they shoot well. Acceptability depends on the size of your target and maximum range you intend to shoot. For my medium sized game hunting with a 6.5x284 at 2975FPS, a SD of 6.5 (ES of 20 FPS)is more then sufficient to make a vital area hit at 1000 yards. Vernon Speer found that there was a scarcity of bullets for reloaders during WWII. If I let the default powder measure on the Dillion 550 do the powder charges I sometimes get up to 30 fps. Mean velocity - 2522 Standard deviation - 21.0 fps ES - 80 fps 1049 FPS, Avg. Remember that a lot of factory ammunition has a standard deviation in velocity of 35 ft/sec and that reloaded ammunition typically runs as much as 50 ft/sec. The more accurate the ammunition being tested, the lower the Mean Radius will be, and the lower the Standard Deviation. In addition to that, we also produce sporting and hunting ammunition. Using factory ammo as a reference, most premium grade handgun ammo will be +or- 25 fps in an individual gun for a max spread of 50 fps. Note also that the standard deviation of the velocity of the overhead fire ammo is smaller, and there is an additional requirement to temperature-condition the sample cartridges prior to velocity testing. “Military Grade” or “MilSpec” is largely marketing, but there is a difference between ammunition intended for military use versus ammunition for the civilian market. Notwithstanding good PCP's are super accurate there are still external factors that can take your shot out of destination. The new Hornady round is loaded with only 5.6 grains of a spherical propellant so a small deviation in charge weight is really a large percentage of variation. Standard Deviation: 42 Comparing the standard deviation of these two loads is very telling. I think this needs looking into further. Well, when I went into this project, I must admit that I was a bit skeptical about finding any improvements. The most accurate are some for the .460 with an average velocity of around 1950 and a standard deviation of under 5. My usual ammo is Hornady ELD-Match with a fairly heavy bullet available for each of those caliber variants (147gr for 6.5-CM and 195gr for .300-WM). The .17 HMR ammo is uniform, and this is no small feat. This box had the highest standard deviation (SD) of any of the Defender Ammo samples tested; 27 FPS. It is not uncommon for factory ammunition to have an SD of 18 or higher. Ranger SXT was fired into water at an average velocity of 980 ft/sec. Should I need to produce 100’s of rounds of ammo I would take a close look at the standard deviation (SD) and possibly do more & look at low & high averages at each side of the distribution curve. The cases were still slightly belled. Accuracy: Obviously, any factory loaded ammunition will be above that range, but the Hornady loads are much more consistent than the ZQI. This consistency helps explain the ammo’s accuracy. In the Bullberry, 1702 fps, 2.00-inch groups and expansion to 0.4154 inch. As soon as the weather improves a little we will be testing the ammo ourselves and publishing the results.) Its accuracy ranked near the bottom, both in group size and standard deviation. If your ammo is not consistent it is junk. The distances can be mathematically massaged by calculating the standard deviation for the distances of the holes in the group, where the standard deviation is a value of the dispersion of the plotted locations. This ammunition is all headstamped 1955, made for a variety of rifles and machine guns including the ZH-29, ZB-26, and FN BAR. Ammunition, factory or otherwise, that performs consistently below 25 fps ES will be extremely difficult to realize. Standard Deviation for people that are unaware is how much the velocity will deviate from its average. Again, insignificant difference in velocity,etc. All times are UTC . Ammo Store in Los Angeles specialists LAX Ammo LA discusses further: Barnes VOR-TX LR. 1) and a large number of rifles so chambered has kept the .300 Savage in the viable category among purveyors of factory ammo and components. … This over the counter Match Grade and Precision Hunter Ammunition just saved me the expensive and time-consuming task of … Does anybody have any good thoughts on what would be an acceptable standard deviation? Ill second this. Group sizes ranged from .918″ to 2.725″. Average group size was 1.986″ with a standard deviation of .558″. Note the first two groups, with the lowest average T.I.R. has group sizes larger than the average, 2.096″ and 2.192″ respectively. The smallest group, .918″, was fired with an average T.I.R. of .004. Standard Deviation: 25, 5. 10 fps or less SD is typically the goal of most handloaders, and very … As a reference point on expected standard deviation of MVs, for 55 grain American Eagle FMJ ammo I get from 20 to 25 fps. And found that the largest standard deviation was 9.2 or 23 feet per second. The string we shot showed very good numbers, giving an average of 3209-fps, with only a 23-fps extreme spread and an 8-fps standard deviation! The HSM Range ammo didn’t do too bad though it is not up to the same accuracy as their standard match is. Maximum Range (100 - 2000 yds) 500 yds. I remember a few years ago testing some factory ammo and getting a … (We compared the extreme spread and standard deviation of Nutmeg’s ammo testing to that of factory new ammo, and the consistency seems to be as good. Different day, SP = 20.90", 19 rounds. We have been manufacturing ammunition since 1928 and currently we supply ammunition to the armed forces and police of Serbia as well as many other countries. The big surprise was the Standard Deviation number on the SilencerCo ammo. These rounds are final-packaged directly at the production line, and then shipped straight to you. For the strings of ten I was running there was somewhere between 24-28 FPS standard deviation. Start load, 41.7 grains 4064: Last load in range, 42.3 grains 4064: The utilization of match primers ensures a consistent powder ignition. More recently bought some of the new ELEY .38 Super Comp to try out. Standard deviation was a remarkable 7. Alliant RL-22 - Frozen - Hot - Difference. Rifle Chamber Pressure Testing Hardware & Software PressureTrace II ™ is a single channel high-speed physical event data acquisition system that captures changes to pressure inside your rifle chamber in real time. Now if we look at the groups, we find that the crimped ammo shot approximately 10% better. I remember a few years ago testing some factory ammo and getting about a 40 FPS SD. I loaded up a bunch of IMR SR 7625 4.6 grains with 124 grain MG CMJs loaded out to 1.155 will all Blazer and Speer brass. One cartridge that produces a velocity well outside the average velocity of the group can create a larger ES. In traditional factory ammunition, velocity standard deviations of 15-20+ fps and extreme spreads of 60-100fps are not uncommon occurrences. Poor quality ammunition is going to result in sub-par performance from any firearm, so when you want the absolute best accuracy from your rifles or handguns then you’re going to want to buy what’s called match ammo. Extreme Spread: 34, 6. Also, there have been great strides with factory ammunition in terms of standard deviation of velocity. Is there anything I … While factory ammo just keeps getting better, I still prefer reloading for best accuracy and cost savings. The Berger 185 Juggernauts and 215 Hybrids have also set the standard for factory .300 WinMag ammo. It is not uncommon for factory ammunition to have an SD of 18 or higher. STANDARD RIFLE AMMUNITION. The Hornady 178 grain ELD-M in .308 Win. In short, a high ballistic coefficient is indicative of a rounds ability to resist drag. I carefully fired and recorded data on almost 1,000 rounds of A ammo factory is able to fill the ammo magazines with rounds that allow a normal distribution with unknown mean μ and known standard deviation σ=7 (ml). The hornady 140gr eldm was the best and sub moa. has had the lowest extreme spread (ES) and standard deviation (SD) of any factory ammunition we have tested. Well, when I went into this project, I must admit that I was a bit skeptical about finding any improvements. I have chronoed a lot of factory ammo as well many handloader's ammo and what I find is about 40% of handloaders can best or equal the standard deviation of "good" factory ammo. This 147-gr. * First, all military ammunition is ball (full metal jacket). Standard Deviation for the factory FGMM was was in the low teens, and I found it interesting to note the velocity, and the 10-to-5 o'clock dispersion axis/pattern Based on Mr. Newberry's recommedations I threw built 4 sets of 5 cartridges, increasing the charge weight by .2 grain. The combination of good performance on medium game (Ref. We are quick to express our handgun ammo in terms of standard deviation, but what is standard deviation and of what significance is it? LRN using 5.0 gr. With extremes such as these, the ammo was still holding to its true half MOA (Minute of Angle) specifications and better. Accuracy performance, however, was amazing. { Home Page | } It also produces extremely small groups at 25 yards. Conversely, my handloads with the Sierra 77-grain TMK hit 3,003 fps — out of the 18-inch barrel — and turned in low extreme spread and standard deviation. Kimber's Stainless Target II is a 38-ounce, full-size 1911 with target adjustable sights that are dovetailed into the slide. Does anybody have any good thoughts on what would be an acceptable standard deviation? Because of this, there are now several amazing gig game factory loads. Please use a 99% confidence interval (ln,un) for … I figured that maybe it was a "revolver day" so I tried the 9mms in a S&W 547 (which is essentially a 9mm Model 10) and got a 3-1/2" group. There was only 1-fps spread showing between the fastest and the slowest rounds. 84.4%. Velocity is not the be all end all. As an aside, an effect I didn't foresee was that hot ammunition — at least in this case — is more consistent than cold ammo. The 250-grain factory load shot as follows: In the T/C, 1637 fps, 2.24-inch groups and expansion to 0.4184 inch. Standard Deviation (SD) { Home Page | } Sometimes as high as 40+. This still isn’t bad for .223 ammo. As I … My standard deviation was 19. For factory ammo, these types of numbers are very consistent and show the time and quality HSM puts into loading this ammunition. No middle-men, no expensive packaging, no meaningless frills. When I load match ammo for bullseye competition I work for an SD of 4 or less. I tried 130 bergers, smks, fgmm, etc. Standard Ballistic Calculator. Velocity is not the be all end all. I chronograph everything carefully on a LabRadar, and get standard deviations usually in the high-teens, sometimes more. Mean velocity - 2668 fps Standard deviation - 21.7 fps Extreme spread - 71 fps Hornady 147 grain ELD Match, LabRadar.
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