July 4th, 2017

This Independence Day, Remember our Nation’s Heritage

July 4 4th Fourth Declaration of Independence Founding Fathers Nation Holiday

American USA FlagToday, July 4th, we are celebrating a special birthday — the launching of a new nation that would become the world’s greatest exemplar of freedom and democracy. In our modern world, it is easy to lose sight of the challenges that faced our fore-fathers, and the continuing burdens we all share, as Americans, to maintain the struggle for freedeom, both at home and abroad. It is more important than ever that we remember the ideals on which the nation was founded, and remember that our nation became great through the efforts and talents of a free citizenry, not through an all-powerful central government.

In the Beginning — Overcoming Great Odds
In a July 4th speech, Navy Lt. Ellen Connors wrote: “Our nation declared its independence in order for our families to live free –- not just for one generation but for future generations. And what odds [the founding fathers] faced. It must have seemed impossible. Our forefathers went up against the world’s most colossal empire since ancient Rome. No colony had ever successfully left a mother country to set up a self-governing state.”

Lady Liberty Fireworks 4th July

The Price of Freedom… The Pride of A Nation
Here is a selection from Daniel Webster’s July 4th, 1851 Oration. His words ring true even now:

On the 4th of July, 1776, the assembled Representatives of the United States of America in Congress declared that these United Colonies are, and of right ought to be, FREE and INDEPENDENT States. This Declaration, made by most patriotic and resolute men, trusting in the justice of their cause and the protection of Heaven, and yet made not without deep solicitude and anxeity, has now stood for seventy-five years, and still stands. It was sealed in blood. It has met dangers, and overcome them; it has had enemies, and conquered them; it has had detractors, and abashed them all….

Every mans’ heart swells within him… as he remembers that seventy-five years have rolled away, and that the great inheritance of liberty is still his — his, undiminished and unimpaired, his in all its original glory; his to enjoy; his to protect; and his to transmit to future generations.

You can download a high-resolution version of the above image from Fireworks.com.

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July 4th, 2017

How Ammo Temp Affects Pressure, Velocity, and Point of Impact

Sierra Bullets Ammunition Ammo temperature temp test hot F-Class Ammo cold
In this .308 Win test, 70° F ammo shot 96 FPS slower than ammo heated to 130.5° F. And the 130.5° ammo was 145 fps faster than ammo right out of the freezer (at 25.5° F). That’s a huge difference…

EDITOR’s NOTE: The Sierra tester does not reveal the brand of powder tested here. Some powders are much more temp sensitive than others. Accordingly, you cannot extrapolate test results from one propellant to another. Nonetheless, it is interesting to see the actual recorded velocity shift with ammo temperature variations in a .308 Win.

Written by Sierra Chief Ballistician Tommy Todd
This story originally appeared in the Sierra Bullets Blog
A few weeks ago I was attending the Missouri State F-Class Match. This was a two-day event during the summer and temperatures were hot one day and hotter the next. I shot next to a gentleman who was relatively new to the sport. He was shooting a basically factory rifle and was enjoying himself with the exception that his scores were not as good as he hoped they would be and he was experiencing pressure issues with his ammunition. I noticed that he was having to force the bolt open on a couple of rounds. During a break, I visited with him and offered a couple of suggestions which helped his situation somewhat and he was able to finish the match without major issues.

He was shooting factory ammunition, which is normally loaded to upper levels of allowable pressures. While this ammunition showed no problems during “normal” testing, it was definitely showing issues during a 20-round string of fire in the temperatures we were competing in. My first suggestion was that he keep his ammunition out of the direct sun and shade it as much as possible. My second suggestion was to not close the bolt on a cartridge until he was ready to fire. He had his ammo in the direct sunlight and was chambering a round while waiting on the target to be pulled and scored which can take from a few seconds to almost a minute sometimes.

This time frame allowed the bullet and powder to absorb chamber [heat] and build pressure/velocity above normal conditions. Making my recommended changes lowered the pressures enough for the rifle and cartridge to function normally.

Testing Effects of Ammunition Temperature on Velocity and POI
After thinking about this situation, I decided to perform a test in the Sierra Bullets underground range to see what temperature changes will do to a rifle/cartridge combination. I acquired thirty consecutive .30 caliber 175 grain MatchKing bullets #2275 right off one of our bullet assembly presses and loaded them into .308 Winchester ammunition. I utilized an unnamed powder manufacturer’s product that is appropriate for the .308 Winchester cartridge. This load is not at the maximum for this cartridge, but it gives consistent velocities and accuracy for testing.

I took ten of the cartridges and placed them in a freezer to condition.

Sierra Bullets Ammunition Ammo temperature temp test hot F-Class Ammo cold

Sierra Bullets Ammunition Ammo temperature temp test hot F-Class Ammo cold

I set ten of them on my loading bench, and since it was cool and cloudy the day I performed this test I utilized a floodlight and stand to simulate ammunition being heated in the sun.

Sierra Bullets Ammunition Ammo temperature temp test hot F-Class Ammo cold

I kept track of the temperatures of the three ammunition samples with a non-contact laser thermometer.

The rifle was fired at room temperature (70 degrees) with all three sets of ammunition. I fired this test at 200 yards out of a return-to-battery machine rest. The aiming point was a leveled line drawn on a sheet of paper. I fired one group with the scope aimed at the line and then moved the aiming point across the paper from left to right for the subsequent groups.

NOTE that the velocity increased as the temperature of the ammunition did.

The ammunition from the freezer shot at 2451 fps.

Frozen FPS

The room temperature ammunition shot at 2500 fps.

Room Temperature FPS

The heated ammunition shot at 2596 fps.

Sierra Bullets Ammunition Ammo temperature temp test hot cold

The tune window of the particular rifle is fairly wide as is shown by the accuracy of the three pressure/velocity levels and good accuracy was achieved across the board. However, notice the point of impact shift with the third group? There is enough shift at 200 yards to cause a miss if you were shooting a target or animal at longer ranges. While the pressure and velocities changed this load was far enough from maximum that perceived over pressure issues such as flattened primer, ejector marks on the case head, or sticky extraction did not appear. If you load to maximum and then subject your ammunition to this test your results will probably be magnified in comparison.

Sierra Bullets Ammunition Ammo temperature temp test hot cold

This test showed that pressures, velocities, and point-of-impact can be affected by temperatures of your ammunition at the time of firing. It’s really not a bad idea to test in the conditions that you plan on utilizing the ammo/firearm in if at all possible. It wouldn’t be a bad idea to also test to see what condition changes do to your particular gun and ammunition combination so that you can make allowances as needed. Any personal testing along these lines should be done with caution as some powder and cartridge combination could become unsafe with relatively small changes in conditions.

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July 4th, 2017

Popular Powders in Stock at Midsouth and Powder Valley

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It’s July 4th, that means fireworks displays. What better time to order up some gunpowder? We’re pleased to report that Midsouth Shooters Supply and Powder Valley have received some big shipments from the major powder makers. In stock now at Midsouth and Powder Valley are many of the most popular accuracy powders, including: Hodgdon Varget, Hodgdon 4198, Hodgdon 4831, IMR 4166, IMR 8208 XBR, Vithavuori N133, Accurate LT30 and LT32, Norma 203B, Alliant Reloder 15, and many more. Sorry these vendors don’t have H4350 and Reloder 16, but Midsouth has the vast majority of the propellants our benchrest and precision shooters favor.

H4198 and LT30 are great for the 30BR, AR Comp and CFE 223 are excellent for Service Rifle shooters, VV N133 is a top choice for the 6PPC, Norma 203B (nearly identical to Reloder 15) is great in the 6mmBR and Dasher, IMR 8208 XBR is very accurate in the .308 Win, and Hodgdon H4831 is an excellent choice for the .284 Winchester and 7mm WSM.

All these popular Powders (and many more) are in stock:

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