Best Velocity for Slugs to Minimize Wind Drift - HAM Article

[Ezana4CE]

Here’s a topic I know almost nothing about, but I’ve seen the questions and the dialog in the forums several times, so I figured it would be of value to someone here.

A Bob Sterne article.

What’s The Best Velocity For Slugs To Minimize Wind Drift?

In July 2029, HAM published Technical Editor Bob Sterne's article on the best velocity for slugs to minimize wind drift. Here's more detail.

hardairmagazine.com

 

[Motorhead]

July of 2029 ... Lol That would be 2019
Ah if only we could read the future .. would we want too ?

Great article tho

 

[DesertSilver]

July of 2029 ... Lol That would be 2019
Ah if only we could read the future .. would we want too ?

Great article tho

That's the question. If you could know when you would die would you want to know?

 

[Ezana4CE]

July of 2029 ... Lol That would be 2019
Ah if only we could read the future .. would we want too ?

Great article tho

@Motorhead I thought it was a typo when the “9” was hit inadvertently when the editor meant to hit “0” and the date may have supposed to have been 2020.

 

[Motorhead]

Doubly incorrect .. love it

All in FUn

 

[Ballisticboy]

As I know Bob would readily admit, the G1 law is not good for slugs, even though everyone uses it. The original article was written in 2019 before Bob and I were communicating on a regular basis on airgun external ballistics. MERO (which can be found here https://gpc.fotosoft.co.uk/) also contains the experimental slug drag law SLG0 which should approximate more closely to the current slug design shapes, possibly changing the optimum velocity values. However, it is unproven and needs measured data to improve the shape of the drag curve. Bob's article on the SLG0 drag law can be found here https://hardairmagazine.com/ham-columns/some-new-airgun-slug-drag-models-by-miles-morris/

MERO is part of the only ballistic software containing the SLG0 drag law.

 

[Airgun-hobbyist]

As I know Bob would readily admit, the G1 law is not good for slugs, even though everyone uses it. The original article was written in 2019 before Bob and I were communicating on a regular basis on airgun external ballistics. MERO (which can be found here https://gpc.fotosoft.co.uk/) also contains the experimental slug drag law SLG0 which should approximate more closely to the current slug design shapes, possibly changing the optimum velocity values. However, it is unproven and needs measured data to improve the shape of the drag curve. Bob's article on the SLG0 drag law can be found here

MERO is part of the only ballistic software containing the SLG0 drag law.

This is a very interesting article on the new airgun drag law theory. I hope it gets incorporated and readily used by the people making the ballistic calculator apps. I found that strelok pro would need multiple bc's to be accurate at fairly short ranges as well as extreme long ranges depending on the speeds and projectile used (using the G1 model).

 

[steve123]

I had no idea.

Thanks for the info.

 

[revenger]

Believe I read something from Sierra bullets that in exception for bullets in supersonic flight, that the next highest BC happened around 1050 FPS. I will have to find the actual text but thought that was interesting. An air gun platform may see best slug performance just over 1000 FPS.