Ballistics of Pellets — and .30 cal: Say again?!?

[JungleShooter]

Ballistics of Pellets — and .30 cal:
Say again?!?

I received the text quoted below in an email from an airgun shop.
And I'm still scratching my head trying to understand what the shop is trying to say.....

Can you help me out understanding the parts marked in bold with a ?


And: Why are .30 pellets different than other pellets (which seems to be what the text is saying)?

Matthias




—————— Begin of quote:

When looking for the most accuracy out of your 30 cal 44 grain pellets you need to understand one thing to understand why the speed recommendations below.

Pellets are stabilized by drag and not centrifugal force like a football when it is thrown. Pellets that are shot too fast will be become unstable and will begin to flip and will never hit is target.

Pellets shot too slow will not have enough speed to maintain stabilization and will fall out of the sky quickly and will not buck the wind as good as when shot at the optimal speed.

30 cal 44 grain pellets are best shot at around 830-890 fps. Why the large gap? Ever air rifle manufacture is different and the twist rates with in the barrel is also different. So the range is there to help you get your speeds close then it is up to you to test at various speeds to get the most accuracy at the distances your are looking to shoot.

Shop our 30 cal pellets below and get to testing your air rifle to achieve the best accuracy."

—————End of quote.

 

[Motorhead]

A Diablo pellet is nearly always weight biased to the head and with that alone WILL NOT flip around.

Too slow ... they just have a more pronounced ARCH trajectory and won't shoot as far ... fall from sky, LOL everything does that is not self propelled, it's called Gravity.

Speed shot ... and the twist rate of barrel go hand in hand. A SLOW twist barrel such as FX Superior heavy or SKOUT can shoot that 44.75 grain faster than a slower or conventional twist rate. WHY ? because of RPM generated is less on a slow twist barrel which allows initial faster launch speed having the loss of forward speed over distance and retained RPM destabilize it later in flight, further down range. Exactly what happens when you shoot most any pellet to fast .. it flies ok for a spell until speed erodes enough and retained RPM is too high it goes into a spiral flight path.

Your AG shop guru is lacking in real world air gun ballistics seeming as if talking from info spoken by others equally ignorant ?

Just my take & I could be full of it too

 

[Ballisticboy]

They don't know what they are talking about. You can tell that immediately by their second paragraph. Pellets are not, never have been and hopefully never will be drag stabilized (who wants to shoot pellets with a parachute attached to the back of them). The flare stabilization they do have reduces as speed gets nearer to sound speed and is highest at low speeds, below about 600 ft/sec. Pellets are aerogyro stabilized, using a combination of both gyroscopic and aerodynamic stabilization.

 

[alimanya]

Interesting info about pellet stabilization.

 

[Ballisticboy]

Interesting info about pellet stabilization.

Do not bother with that video, it has a large number of mistakes, both small and large (about 21 at the last counting). The whole basic assumption of the video is completely wrong, showing a basic lack of understanding of aerodynamics and ballistics in regard to projectile stability. That is why I wrote the threads on pellet and projectile stability to try to explain projectile stability and the real methods of stabilization.

Pellet Stability

This has appeared on a few forums, mainly in the UK, so some of you may have seen it before. I have tried to make it as simple and none technical as possible. Quite often you will see someone mentioning stability, talking about how pellets go unstable as they slow down or are more accurate...

www.airgunnation.com

Aerodynamic Stability of Pellets

The aerodynamic stability of pellets is a grossly misunderstood subject, mainly it must be said due to misinformation on the internet in videos and articles by "experts". I have previously tried to explain the different types of stability used by pellets. Here I hope to be able to debunk a very...

www.airgunnation.com

Gyroscopic Stability

This is going to be the most technical of the threads on pellet or slug stability. I am going to try to explain how gyroscopic stability works. It is a relatively simple phenomenon, easy to demonstrate in a 3D environment, but not easy to show on a 2D screen. Some people misunderstand what...

www.airgunnation.com

 

[Struckat]

That’s the second or third time I have read those posts, excellent material and you do a very good job explaining to a simpleton like me.

I will read it all several more times in the future, but know that I will never be able to speak to the subject.
Absorb what I can and keep learning.