Now that Vince has tuned the Sterling, it’s time to see how she shoots.
It’s time to see how the Sterling underlever rifle shoots. Benjamin put Lothar Walther barrels on these rifles, so I’m hoping the pedigree will show in today’s test. Vince got the velocity back up to a respectable level, as we saw in Part 3 (and Vince showed you what he did to the gun in his guest blog about the Sterling), so there should be nothing to prevent the gun from shooting its best.
When I went to mount a scope, I saw that the Sterling has two vertical holes that can be used for a scope stop. They’re located where the front ring needs to be, but with two-piece rings that presents no problem.
This is the second of my reports on the 2012 SHOT Show. There will certainly be at least one more after this, and perhaps even more, as there’s simply too much new information to pack into a single report.
The state of the airgun industry in 2012
Before I get to some specifics, I want to make a general observation. This year’s SHOT Show was different for me in a major way, because I saw for the first time that firearms shooters are beginning to understand airguns as never before. In the past, I always had to start my explanations with the cooling of the earth’s crust and then progress through the age of the dinosaurs because each firearms person I talked to thought of airguns as either toys or BB guns. This year, a lot of them were clued-in on what’s happening. They weren’t surprised by the accuracy we get, and they knew about big bores. A lot of them had some airgun experience and more than a few asked me the same kind of questions that I get from long-time readers of this blog.
The Sterling by Benjamin Sheridan is an air rifle not many have seen or even heard about.
Say hello to my little friend! We last saw this Sterling 11 months ago and discovered during testing that the velocity was very unstable. Variations of 61 to 147 f.p.s. were found in the 10-shot strings, even though the rifle had been recently tuned by reader Jim Grossman (Jim in PGH). Clearly, something seemed to be wrong. I stopped the test right there because I didn’t want to damage the mechanism, and I set it aside for later when I could I eventually look inside.
Well, our No. 1 tuner and all-around good guy — blog reader Vince — stepped forward and offered to have a look at it for me. He told me he’d worked on another Sterling, and I was relieved because I didn’t have to learn the complexities of yet another odd spring-gun mechanism. This one is odd because, in addition to the underlever that cocks the mainspring, the gun also has a bolt-action that opens the breech for loading a pellet. It’s quirky and unlike just about any other airgun you’ve seen.
One nice thing about watching a TV program is that it only takes an hour or less to view. You have no sense of the man-weeks of work that go into a short production on screen. Sometimes, the same thing happens in the world of airgun blogs.
I won’t say I’ve been dreading today’s report; but from past experience adjusting the HOTS on the Whiscombe rifle, I knew it might take longer than anyone could imagine to get a good result. It’s easy to say, “Adjust the HOTS for optimum performance with a certain pellet.” Actually doing it is where you discover if it’ll be easy or hard. The report I have for you today was very hard.
For those who celebrate Christmas, Merry Christmas from Edith and me! This is our last opportunity to wish you a Merry Christmas before Sunday, but I would like to hear on Monday from anyone who received an airgun, airgun-related gift or a firearm for Christmas. I’ll tell you what I got, too.
Today, we’ll complete the testing of the four pellets at four different velocities in the Whiscombe rifle. The premise of this test has been to explore the effects of velocity on accuracy by shooting the same pellets in the same pellet rifle at four differing velocities. I will make today’s report and comment on how the test went, but this will not be the final installment of this test. There will be at least one more summary report that puts all the data into perspective. And if there are side issues to explore, maybe there will be more reports.
This is an exploration into the theory that high velocity reduces pellet accuracy when it reaches and exceeds the transonic speed region, or about Mach 0.8 to 1.2. We have thus far examined four different .177 pellets at three different speed levels, produced by shooting them in a Whiscombe JW75 spring rifle. Because all pellets have been fired in the same barrel and powered by the same powerplant, the conditions have remained the same, except for their velocities. That was altered by the use of air transfer ports of varying sizes, that passed the compressed air at differing rates.