What exactly is Center of Pressure? Todays Daily Bulletin is GOOD!!!

[Mulligan]

Daily Bulletin

Best site for precision rifle accuracy and accurate shooting. Daily Bulletin Blog for AccurateShooter.com 6mmBR.com has 223 243 308 6mm 7mm caliber accuracy reloading data. Benchrest, F-Class, Tactical, Varmint, High Power. Rifle accuracy tips. Scopes optics. Ballistics. Winchester Lapua brass...

bulletin.accurateshooter.com

What is the definition of Center of Pressure?

CW

 

[jelenko]

From NASA

I had the same question. There is more discussion at https://www.grc.nasa.gov/www/k-12/airplane/cp.html

 

[FeMan]

Great videos. I love Mr. Litz's stuff! The center of pressure is the centroid of the drag forces acting on the bullet in flight. It is a function of bullet shape and angle of attack.

 

[JEFFPPC]

In a nutshell what the bullet does is a combination of twist vs velocity. I think most knowledgeable shooters are aware of this. Not new and starteling information. Bryans books are interesting and worth reading ( mine are on my loading bench) but the ultimate info needed will show up on the targets you shoot with your guns and loads . Nothing approaches real world testing to give you answers.

 

[jackieschmidt]

If you have ever talked to Randy Robinett, you can learn a lot about twist rates, the rpm of the bullet as it relates to bullet stability, and why the proper twist rate/bullet combo is important.

In the short range game, 100/200/300 yards) BC is a non issue.if you look at the numbers on paper, most of us in Group Shooting are using the wrong twist at 13.5 to 14. The numbers say a 1-12 would be the best for the typical 65/68 grn bullet Combinations Built on a .795 or .825 jacket.

But I know of very few shooters who shoot a 1-12.

The holes in the target are as good of a gage to how stable the bullet is. This is one of mr 200 yard targets from last Sunday’s match at Lake Charles, shooting in 15+ mph winds.

That is my 68 grn bullet on .825 jackets out of a 13.85 to 13,75 Bartlien Going around 3425 fps.

A 1-12 might be ideal, but those holes in the paper tell a good story.

 

[Mulligan]

If you have ever talked to Randy Robinett, you can learn a lot about twist rates, the rpm of the bullet as it relates to bullet stability, and why the proper twist rate/bullet combo is important.

In the short range game, 100/200/300 yards) BC is a non issue.if you look at the numbers on paper, most of us in Group Shooting are using the wrong twist at 13.5 to 14. The numbers say a 1-12 would be the best for the typical 65/68 grn bullet Combinations Built on a .795 or .825 jacket.

But I know of very few shooters who shoot a 1-12.

I have had that conversation with Randy several times, a wealth of information indeed.

I have also had the same conversation, on the same day with Bart Sauter and Lowell Frei.
I decided that for, long for caliber bullets, moving relatively slow, it (RPM) matters more so, than for short, fast bullets.

CW

Edited for grammar

 

[Tommie]

Center of pressure and center of gravity was, of all things, covered in a film “The World’s Fastest Indian”. The concept and how it applies to stability is explained in terms even I could understand.

And it’s a very cool movie.