April 2nd, 2019

Vortex C.O.B.R.A. Smart-Scope + Personal Assistant

Vortex April Fools video cobra c.o.b.r.a. smartscope voice activation humor joke video optics

Yesterday, April Fools Day, websites offered their best prank stories to readers. Our own 7.6 Creedmoor satire fooled more than a few folks it seems. There were some pretty good spoof videos as well, none better than this very funny production from our friends at Vortex Optics. The video showcase Vortex’s new C.O.B.R.A., a state-of-the-art smart-scope with the capabilities of an Alexa-type digital assistant. Watch the video — you’ll see that the clever C.O.B.R.A. has a mind of its own. Enjoy!

C.O.B.R.A. from Vortex
Introducing Vortex C.O.B.R.A., the Combat Optic Battle Ready Assistant, a virtual personal assistant fine-tuned with features specifically for hunters and shooters. Embedded into select Vortex riflescopes, you can now control your smart-scope with the power of your voice. Bore-sighting, dialing turrets, adjusting magnification, and setting your zero stop are just some of the hundreds of tasks that can be accomplished with simple hands free commands. Get C.O.B.R.A, and get your scope working for you!

Vortex April Fools video cobra c.o.b.r.a. smartscope voice activation humor joke video optics

Permalink - Videos, New Product, Optics 2 Comments »
April 2nd, 2019

17 Mach 2 Straight-Pull Summit Rifle from Volquartsen

17 mach 2 .17 hm2 volquartsen summit

The 17 Mach 2 (aka “17 HM2″) is making a come-back. We’re glad. This high-velocity round fits actions and magazines designed for the .22 LR, so it’s an easy barrel-swap upgrade for most rimfire bolt-guns (semi-autos are more complicated). The 17 Mach 2 cartridge doesn’t deliver the velocity of the 17 HMR, but it is still way faster than a .22 LR. Expect 2000-2100 fps with 17 Mach 2 compared to 1250 fps for “High-Velocity” .22 LR ammo. And, importantly, 17 Mach 2 ammo is much less expensive than 17 HMR. If you shop around, you can get 50 rounds of 17 Mach 2 for about $6.50. That’s 40% cheaper than the average $11 price of 17 HMR — a significant savings!

17 Mach 2 Major Selling Points:

1. 60% more velocity than typical “High-Velocity” .22 LR ammo.
2. 40% less cost than average 17 HMR ammo.
3. 17 Mach 2 OAL is compatible with .22 LR receivers and magazines.

Toggle Bolt Volquartsen Summit in 17 HM2

It’s rare for us to see a new rimfire that we’d really like to own, but the new Summit from Volquartsen fits the bill. This versatile rifle features a cool, straight-pull toggle bolt, similar to those on elite Biathalon rifles. You can see how this gun shoots in this informative 22 Plinkster video:

22 Plinkster Tests Volquartsen Summit Rifle in 17 Mach 2

The 17 Mach 2 (17 HM2) is making a comeback. Now leading manufacturers are offering this efficient little rimfire cartridge in some nice rifles. Both Anschutz and Volquartsen will offer new 17 Mach 2 rifles in 2019. The Volquartsen Summit features a lightweight, carbon fiber-wrapped barrel threaded 1/2-28 for brakes or suppressors. The Summit boasts a nice 1.75-lb trigger pull. The Summit’s CNC-machined receiver features a +20 MOA Rail. NOTE: The video shows a silhouette-style laminated wood stock. However, the Summit comes standard with a composite Magpul stock that actually works better for shooting from a bench.

17 mach 2 .17 hm2 volquartsen summit

17 Mach 2 — Best Rimfire Bang for the Buck?

If you are looking for a capable, squirrel-busting round or a fun plinking round, you should definitely consider the 17 Mach 2, especially since CCI has committed to production of the little cartridge. CCI recently rolled out its “Gen 2″ 17 Mach 2 VNT Ammo with polymer tip (photo right).

17 mach 2 .17 hm2 volquartsen summit17 mach 2 .17 hm2 volquartsen summit
The 17 Mach 2 propels the same 17gr bullet as the 17 HMR, but the 17 Mach 2 runs roughly 20% slower — 2000-2100 fps vs. 2500 fps for the 17 HMR.

Considering that 17 HMR ammo is now running $10 to $12 a box, the 17 Mach 2 is an excellent value by comparison. When you consider overall “bang for the buck”, for many shooters, it makes sense to use the 17 Mach 2 rather than a 17 HMR. You save money, barrel life is a little longer, and the 17 Mach 2 is still a much more potent cartridge than the .22 LR. Check out this comparison, and note how the 17 Mach 2 has a much flatter trajectory than the .22 LR:

17 Mach 2 hm2 .22 LR comparison
Hornady’s 17 Mach 2 has a 2100 FPS muzzle velocity vs. 1255 FPS for “High-Velocity” .22 LR.

Permalink - Videos, Bullets, Brass, Ammo, Gear Review, Hunting/Varminting 1 Comment »
April 2nd, 2019

How Bullets Fly — Mysteries Revealed by German Ballistician

Bullet External Ballistics
“The overturning moment MW tends to rotate the bullet about an axis, which goes through the CG (center of gravity) and which is perpendicular to the plane of drag….

Ruprecht Nennstiel, a forensic ballistics expert from Wiesbaden, Germany, has authored a great resource about bullet behavior in flight. Nennstiel’s comprehensive article, How Do Bullets Fly, explains all the forces which affect bullet flight including gravity, wind, gyroscopic effects, aerodynamic drag, and lift. Nennstiel even explains the rather arcane Magnus Force and Coriolis Effect which come into play at long ranges. Nennstiel’s remarkable resource contains many useful illustrations plus new experimental observations of bullets fired from small arms, both at short and at long ranges.

Shadowgraph of .308 Winchester Bullet

Bullet External Ballistics

A convenient index is provided so you can study each particular force in sequence. Writing with clear, precise prose, Nennstiel explains each key factor that affects external ballistics. For starters, we all know that bullets spin when launched from a rifled barrel. But Nennstiel explains in greater detail how this spinning creates gyroscopic stability:

“The overturning moment MW tends to rotate the bullet about an axis, which goes through the CG (center of gravity) and which is perpendicular to the plane of drag, the plane, formed by the velocity vector ‘v’ and the longitudinal axis of the bullet. In the absence of spin, the yaw angle ‘δ’ would grow and the bullet would tumble.

If the bullet has sufficient spin, saying if it rotates fast enough about its axis of form, the gyroscopic effect takes place: the bullet’s longitudinal axis moves into the direction of the overturning moment, perpendicular to the plane of drag. This axis shift however alters the plane of drag, which then rotates about the velocity vector. This movement is called precession or slow mode oscillation.”

Raise Your Ballistic IQ
Though comprehensible to the average reader with some grounding in basic physics, Nennstiel’s work is really the equivalent of a Ph.D thesis in external ballistics. You could easily spend hours reading (and re-reading) all the primary material as well as the detailed FAQ section. But we think it’s worth plowing into How Do Bullets Fly from start to finish. We suggest you bookmark the page for future reference. You can also download the complete article for future reference and offline reading.

CLICK HERE to download “How Do Bullets Fly” complete text. (1.2 MB .zip file)

Photo and diagram © 2005-2009 Ruprecht Nennstiel, All Rights Reserved.

Permalink - Articles, Bullets, Brass, Ammo, Tech Tip 1 Comment »