Barrel Twist Article

[Damon]

I just wrote this article on barrel twist and bullet stability:

Barrel Twist Article

Seeing as you guys are some of the smartest shooters around, I thought I'd run it by you to see how it reads. Did I get everything right? Does it make sense? Let me know - I will incorporate any feedback.

 

[alinwa]

I just wrote this article on barrel twist and bullet stability:

Barrel Twist Article

Seeing as you guys are some of the smartest shooters around, I thought I'd run it by you to see how it reads. Did I get everything right? Does it make sense? Let me know - I will incorporate any feedback.

Seems a nicely written article. The only item I'll quibble with is the section 'Aerodynamic Jump Caused By The Wind.' I would term that effect "vertical drift" or "vertical deflection" not "aerodynamic jump."

The takeaway section raises awareness but doesn't offer much in the way of solutions....... ........ gonna' step out on the limb and tell HOW to minimize inbore yaw or bullet cant? Care to list some "good reloading and chambering techniques?"


BTW, the article is well proofed. Either you're a good writer or you have access to an English Major

al

 

[Damon]

Thanks for the feedback - your point is well taken regarding the "Practical Takeaway" - it's a bit vague. That's mostly because I don't know the answers!

I can assume that turned necks with tight clearances will help keep bullets from yawing in-bore, but I really don't have any evidence that that *actually* happens. Likewise, chambering a bent chamber isn't going to be helpful.... i think. Do longer bearing surfaces resist tipping more? Lots of questions, few answers. I think that's why you see so little written about interior ballistics. Perhaps that's another article to write some day.

 

[R.G. Robinett]

I just wrote this article on barrel twist and bullet stability:

Barrel Twist Article

Seeing as you guys are some of the smartest shooters around, I thought I'd run it by you to see how it reads. Did I get everything right? Does it make sense? Let me know - I will

incorporate any feedback.

It appears that, on the precession diagram (vertical associated with drag deflection), the angles are incorrectly marked: the 14" twist should cause less vertical component than the 10" twist . . . I think! RG

 

[HuskerP7M8]

It appears that, on the precession diagram (vertical associated with drag deflection), the angles are incorrectly marked: the 14" twist should cause less vertical component than the 10" twist . . . I think! RG

I think you're right and I missed it the first time I looked at it.
The higher the Sg is, the greater the effect from aerodynamic jump. I think? LOL

Landy

 

[Damon]

You are correct! My brain took a vacation when I posted the pictures. I had it right, looked at it, and thought "that's wrong..." and switched it to the incorrect picture. Some days just go like that.

I'll go and switch it back...

Thanks for the catch!

PS I'm also working on a ballistic calculator - will be up on the site soon.

 

[R.G. Robinett]

Once that's correct it's well stated - I didn't intend to be over-critical - just to help you get it technically correct. RG

 

[Damon]

No offense taken - I had it all bass-akwards. That's why I posted it here - I knew someone would be around to catch the mistakes and/or wrong-headedness of my writing! I write as much for my own thought clarification as anything, so I tend to write about topics for which my thoughts are just coming together. Sometimes that makes for unclear prose (or bungled diagrams).

 

[brian roberts]

I just skimmed it..................

and it has an easy drift to it, and should be well received, especially to those starting out who haven't yet started looking at the articles in the loading manuals and trying to figure them out.

I would ask you to read the last sentence, though, I was wondering if the, "...at the at the muzzle..." was on every firearm, or just the "ack-ack" guns.

I did like it, though.