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SIERRA 30 CAL 175 GR.TMK. 30 CALIBER 7. 62MM (. 308) 175 GR. TIPPED MATCHKING (TMK) Sierra has enhanced a segment of the MatchKing line by adding the acetal resin tip, thus crowning the Tipped MatchKing (TMK) bullet line. The major advantage of adding a tip to the bullet is the reduction of drag, producing a more favorable ballistic coefficient. The 175 grain 30 caliber MatchKing (#2275) was created to allow . 308 Winchester shooters to stay supersonic at 1,000 yards. The
.30 CALIBER/7.62MM (.308) 175 GR. TIPPED MATCHKING (TMK)
Sierra has enhanced a segment of the MatchKing line by adding the acetal resin tip, thus crowning the Tipped MatchKing (TMK) bullet line. The major advantage of adding a tip to the bullet is the reduction of drag, producing a more favorable ballistic coefficient.
The 175 grain 30 caliber MatchKing (#2275) was created to allow .308 Winchester shooters to stay supersonic at 1,000 yards. The popularity this advantage created made adding the 175 grain Tipped MatchKing (TMK) bullet a necessity. The 175 grain Tipped MatchKing (TMK) bullet is an excellent choice for F-Class (F Open) matches, as well as 3-Gun and various other competitions
While they are recognized around the world for record-setting accuracy, MatchKing and Tipped MatchKing bullets are not recommended for most hunting applications. Although MatchKing and Tipped MatchKing bullets are commonly used for varmint hunting, their design will not provide the same reliable explosive expansion at equivalent velocities in varmints compared to their lightly jacketed Hornet, Blitz or Varminter counterpar
| Dia (inches) | Weight (grains) | Sectional Density | Ballistics Coefficients and Velocity Ranges |
|---|---|---|---|
| 0.308 | 175 | .264 | .545 @ 2400 fps and above .530 between 2400 and 1800 fps .495 @ 1800 and below |
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4.2 ★★★★★
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★★★★★ 4
interesting science
Format: Hardcover
Under A White Sky, The Nature of The Future, Elizabeth Kolbert, 2021
In 2015 Elizabeth Kolbert won the Pulitzer Prize for her book the Sixth Extinction. In my review of that book, I wrote: Kolbert is not a scientist but a reporter and writer for The New Yorker magazine and as such her book is structured as a series of bylines as she travels around the world reporting on scientists investigating extinctions in both the present and the past. As in that book she adopts the same format but this time investigating “how the very sorts of interventions that have imperiled our planet are increasingly seen as the only hope for its salvation”.
Ice cores from the Antarctic and Greenland have shown that the last 10,000 years of earths history have been the most benign and stable climatological periods in the last 100,000 years. During this time, we have been able to develop agriculture, an amazing technological and a pervasive globe encompassing culture with a population now of almost 8 billion people. Without this unusually stable climate most of our current civilization would probably have not evolved or been possible. Up to this point we humans have taken this for granted thinking that this benign state will somehow last forever. In Kolbert’s last book she emphasized that due to our own rapacious destruction of earth’s ecosystems and our destabilization of climate stability, this situation is coming to an end and not responding is not an option.
Facing an unimaginable crisis of our own making how should we respond? When we intervene, are we smart enough not to cause newer unanticipated problems greater than the original problem we sought to solve? Kolbert travels around the world seeking an answer to this question. She visits places and examples where we historically have tried to solve problems such as sewage in Chicago or taming floods on the Mississippi only to create larger problems such as invasive species or sinking cities such as New Orleans.
The most interesting part of her book is when she addresses the people and places that are using current cutting-edge technology to save ecosystems and reverse global warming. One such example is on the Great Barrier Reef of Australia, one of the most diverse and prolific ecosystems on earth, which is under dire threat from oceanic warming and acidification. Faced with the real possibility of extinction of the reef in just decades, scientists are turning to genetic modification of Corals to make them more resistant to these fast-changing conditions.
Since 2012 a new gene editing technology called CRISPR-Cas has become ubiquitous. In fact, so ubiquitous that you can buy your own “genetic engineering home lab kit” from a company in California called Odin for $1800. Kolbert buys her own kit and is able to engineer a colony of E. coli bacteria into a strain that is resistant to streptomycin antibiotic. She then inserts a jellyfish gene into yeast which then glows in the dark. Sound dangerous? Yes, what could possibly go wrong, but this is also the technology to develop new global warming resistant corals or destroy malaria carrying mosquitos, control rapacious rodents on Pacific Islands or control a plague of Cane Toads in Australia, not to mention breakthrough medical benefits. We have so altered natural systems with invasive species, with climatological chaos that the only solution is further intervention. She quotes a scientist at the Australian Animal Health Laboratory: “What people are not seeing is that this is already a genetically altered environment. Invasive species alter the environment by adding entire genomes that don’t belong. By contrast Genetic engineers, by contrast, alter just a few bits of DNA here and there”. “The classic thing people say with molecular biology is: Are you playing God? Well no. We are using our understanding of biological processes to see if we can benefit a system that is in trauma”.
Do you feel guilty about all the carbon you are emitting into the atmosphere when you drive around in your SUV or eat a filet mignon? Now there is a way to assuage your guilt. There is a now a company called Climeworks that will do just that for the price of $1000 per ton of sequestered CO2. Being that each American emits about 20 tons per year following the American way of life and to totally assuage your guilt will cost you a cool $20,000 per year. Do you feel that guilty? Kolbert purchases one ton of sequestration and then visits the place where the deed is done which turns out to be at a geothermal power plant in Iceland. There they inject CO2 into the hot molten basalt at the bottom of their well to form limestone. This is a way the earth has been doing this process for millions of years without payment. In fact, it is the very process that transpired when the Himalayas were pushed up by the Indian subcontinent million of years ago, sequestered billions of tons of carbon into limestone and enabled the ice ages to begin 3 million years ago. Is this process a feasible solution to our current crisis? According to the latest UN climate report at this point, some form of sequestration is almost certainly required to avoid a catastrophic global temperature rise above 2 degrees regardless of what green technologies are introduced. Almost certainly the cost of that sequestration will have to be drastically reduced.
Is there another way to approach the problem? Here Kolbert interviews scientists who are studying a process called solar geoengineering which involves shooting reflective compounds or crystals into the stratosphere to reflect sun light and reduce the earths albedo or heat absorption. This the same process that occurs when large volcanic explosions expel billions of tons of dust and S02 that block incoming sunlight and cool the planet. Last time a truly global volcanic eruption occurred was Tambora in Indonesia in 1815 and caused catastrophic cooling causing mass famine in various places around the world. Is this a feasible solution? Maybe, certainly not to the extent of Tambora and one side effect might be changing the sky from blue to white and hence the title of the book. Sunsets might be improved however.
This a short book and quick read and one gets the sense that it was somewhat truncated because of the pandemic restricting travel. However, there is still a lot of interesting information about the future fate of our planet and what can be done to ameliorate the damage that we have inflicted. JACK
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Reviewed in the United States on March 1, 2021
★★★★★ 5
I like it
Format: Paperback
In very good condition
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Reviewed in the United States on March 25, 2026
★★★★★ 5
Informative studies of how scientists are trying to address environmental issues today
Format: Paperback
In this book Kolbert travels to visit scientists attempting to address the environmental changes that humans are creating on the planet. The chapters focus on different issues, such as invasive species, and species loss, and includes field site visits, and also references for more reading. If you read this, and Sixth Extinction, and Field Notes From a Catastrophe, you will get a great oversight of some of the environmental issues that we face, although not any neat solutions. All the case studies build up into a wider understanding.
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Reviewed in the United States on December 23, 2023
★★★★★ 3
disappointing
Format: Hardcover
I was excited to read "Under a White Sky". Unfortunately, it seems that the author just sort of stopped writing when COVID hit. See page 197, where author laments the arrival of COVID. FOur pages later, book ends. The author even says on page 197:
"Here I was, trying to finish a book about the world spinning out of control, only to find the world spinning so far out of control that I couldn't finish the book".
Couldn't finish the book, but COULD publish it and sell it to people like me.
The early chapters are interesting, each one covering a different topic related to man messing with nature. Good stuff. But I expect some analysis, some conclusion, something to sum it all up. It just isn't there.
Topic and early chapters showed great promise. But the ending is truly lacking. And as the author alludes, unfinished.
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Reviewed in the United States on March 7, 2021
★★★★★ 4
As A Dominant Species, We Dance On The Razor’s Edge
Format: Hardcover
Under A White Sky
Elizabeth Kolbert’s claim to fame is her book The Sixth Extinction. In comparison Kolbert’s under A White Sky is rather short and disorganized, yet her coverage of those working on solutions to Climate Change is pretty darn interesting. In her conclusion, she writes, “This has been a book about people trying to solve problems created by people trying to solve problems.” Putting this sentence at the book’s beginning rather than buried at its end would have provided a reader a compass to help determine where Kolbert was going with her dialogue.
As she wades through the reversed direction of the Chicago river; Asian carp; Cane toads; forced and accelerated evolution in regard to coral, in particular in regard to the Great Barrier Reef (without discussing the importance of the worlds reefs; the continual flooding of New Orleans both despite and because of the actions of The Army Corps of engineers, one begins to ponder a general connection that might exist, while the book itself is headed toward a two star rating.
Then, Kolbert got to Global Warming and Climate science. The book’s last sixty pages are worth the complete price of admission. The chapter begins with carbon sequestration, the pros and cons of how it can be done, and does it also contribute to the growing problem. The stoppered bathtub” analogy is perhaps the best analogy I’ve heard in regard to the anthropocentric carbon dioxide problem on the Earth. The tub is full of water/ the sky’s CO2 level; the tubs stoppered, so the water isn’t going anywhere, and the atmosphere’s increased CO2 level won’t drop in the near future either; and even if the water flow to the tub is reduced, it will still accumulate until over flowing, as will reduced emissions continue to amass in the atmosphere. In a sense, we are already beyond the tipping point in terms of global temperature increase.
Harvard University Center for the Environment director Dan Schrag says, “I’m a scientist. My job is not to tell people the good news. My job is to describe the world as accurately as possible.” He predicts, due to the fact that the oceans must equilibriate. “If we were to stop CO2 emissions tomorrow, which of course isn’t possible, it’s still going to warm for centuries. That’s just basic physics.” Thus enters the topic of geoengineering, and the connection with people trying to solve problems created by people trying to solve problems truly comes into focus. Kolbert , in a rather clandestine way connects the dots of her past “local problems”, but now the problem fix, if it doesn’t work could create problems beyond solving.
She hits the nail on the head with this. Humans have been around 35-50 thousand years, but only the last ten thousand or so have they thrived, largely due to agriculture and differentiation of what one can do because of agriculture. But ag has only been able to thrive because of the rather consistent global weather of the past ten thousand years, due to glacial retreat. This has been presented in great detail by Jared Diamond in his book Guns, Germs, and Steel. The CO2 we’ve put into the atmosphere isn’t going anywhere, as we continue to pour more into the mix. Her interviews with climate scientists do not bode well for our species, as everything they think of to combat the CO2 conundrum brings more as the bathtub continues to fill. One could say humans have become victims of their own success as a species.
Ultimately, one gets the feeling from Kolbert and her interviews, that the enormous fluctuations in the Earth’s climate over geological time, and those yet to come, render whatever we do as humans as a moot point. The Earth will shake is off as a dog rids itself of fleas. She also brings to the argument, when the blank really hits the fan, as it will despite, or because of any preventative efforts by man, the resulting population displacements will be staggering.
A sobering, informative book as we, as a species, dance on the razor’s edge.
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Reviewed in the United States on September 24, 2021
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