Summer Solstice 2020 was June 20th, and July’s nearly here. That means “peak heat” summer conditions. It’s vitally important to keep your ammo at “normal” temps during the hot summer months. Even if you use “temp-insensitive” powders, studies suggest that pressures can still rise dramatically when the entire cartridge gets hot, possibly because of primer heating. It’s smart to keep your loaded ammo in an insulated storage unit, possibly with a Blue Ice Cool Pak if you expect it to get quite hot. Don’t leave your ammo in the car or truck — temps can exceed 140° in a vehicle parked in the sun.
To learn more about how ambient temperature (and primer choice) affect pressures (and hence velocities) you should read the article Pressure Factors: How Temperature, Powder, and Primer Affect Pressure by Denton Bramwell. In that article, the author uses a pressure trace instrument to analyze how temperature affects ammo performance. Bramwell’s tests yielded some fascinating results.
For example, barrel temperature was a key factor: “Both barrel temperature and powder temperature are important variables, and they are not the same variable. If you fail to take barrel temperature into account while doing pressure testing, your test results will be very significantly affected. The effect of barrel temperature is around 204 PSI per F° for the Varget load. If you’re not controlling barrel temperature, you about as well might not bother controlling powder temperature, either. In the cases investigated, barrel temperature is a much stronger variable than powder temperature.”
This Editor had the personal experience of 6mmBR hand-loaded ammo that was allowed to sit in the hot sun for 45 minutes while steel targets were reset. The brass became quite warm to the touch, meaning the casings were well over 120° on the outside. When I then shot this ammo, the bullets impacted well high at 600 yards (compared to earlier in the day). Using a Magnetospeed, I then chron-tested the sun-heated ammo. The hot ammo’s velocity FPS had increased very significantly — all because I had left the ammo out in the hot sun uncovered for 3/4 of an hour.
Powder Heat Sensitivity Comparison Test
Our friend Cal Zant of the Precision Rifle Blog recently published a fascinating comparison test of four powders: Hodgdon H4350, Hodgdon Varget, IMR 4451, and IMR 4166. The first two are Hodgdon Extreme powders, while the latter two are part of IMR’s Enduron line of propellants.
The testers measured the velocity of the powders over a wide temperature range, from 25° F to 140° F. Hodgdon H4350 proved to be the most temp stable of the four powders tested.
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NRA Cancels WSC and NRA Police Shooting Championships Due to COVID-19
No big money this year at the NRA World Shooting Championship — the event has been cancelled. And Likewise the NRA Police Shooting Championship will not take place in 2020. This is the Year of Pandemic, and two more major shooting events have fallen victim to COVID-19.
Yesterday the National Rifle Association (NRA) issued the following statement:
Due to the circumstances surrounding the COVID-19 pandemic and the many ensuing federal and state safety regulations and mandates, the NRA has made the difficult decision to cancel the NRA World Shooting Championship and the NRA National Police Shooting Championships. Both events were scheduled to be held in mid September 2020 in West Virginia and Mississippi respectively.
We share your disappointment that both these competitions that attract participants from across the globe had to be canceled. The NRA wishes everyone good health and the best of luck. Stay safe and healthy.
The WSC was a big deal. It attracted top multi-gun competitors such as Jerry Miculek, Dan Horner, Doug Koenig, and Bruce Piatt. The winner took home a fat check for $25,000. This unique 3-day multi-gun match tests competitors’ skills across twelve challenging stages involving nearly every major shooting discipline for rifles, shotguns, and pistols. This major match attracted both sponsored Pros and “regular Joes”. Shooters were split into two groups: a Professional Division for sponsored shooters, and the Amateur Division for non-sponsored competitors. All firearms, optics, and ammo were provided by match sponsors for both divisions.
This video shows features of past NRA World Shooting Championship
All Equipment Was Supplied at NRA World Shooting Championship
“What makes this event very unique, especially to a professional shooter, is all the equipment is supplied. You have to leave your ego at home and just try to adapt as best you can to the equipment that you have supplied.” — Jerry Miculek
WSC stages encompassed everything from trap to bullseye pistol to PRS-style precision rifle. There was even a cowboy action stage with Henry “Golden Boy” lever-action rifles.
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CCRKAB Hopes Millions of New Gun Owners Can Aid Second Amendment Battle
First concern over the COVID-19 pandemic spurred a huge increase in gun purchases. And the civil unrest, rioting, and looting that followed the death of George Floyd caused countless citizens to seek armed self-protection. COVID-19 and the riots convinced millions of Americans to become gun owners for the first time. These citizens wanted to protect their families, homes, and businesses. The Citizens Committee for the Right to Keep and Bear Arms (CCRKBA.org) hopes that these new gun owners may aid the fight to preserve the Second Amendment and gun rights in the USA.
“Look at all of the new people who suddenly decided to exercise their Second Amendment rights to keep and bear arms”, observed CCRKBA Chairman Alan Gottlieb. “We’ve witnessed something that is nothing short of a sea change… about gun ownership. We’ve heard anecdotal reports from all over the country about people flocking to gun shops who had never before owned a firearm. Now that they are gun owners, we expect them to be very protective of their rights”.
March, April, and May 2020 saw record numbers of background checks, according to FBI data and information from industry sources. For example in April 2017, gun sales set an all-time record — up 71% from the pervious year.
Gottlieb added: “We welcome all of these new gun owners to the firearms community… many of them are minorities, especially black and female citizens … from all age groups. They can… gain a new understanding of our efforts to protect the one fundamental right that actually protects all of the other rights.”
“This new wave of gun owners could become a formidable force during this year’s election,” Gottlieb noted. “From now on, we expect millions of new gun owners to pay closer attention to candidates, and reject those who would trample on their Second Amendment rights. With legions of new gun owners ready to protect these newly-discovered rights, it could be a pretty scrappy election year…”
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To learn more about how ambient temperature (and primer choice) affect pressures (and hence velocities) you should read the article 
