[Oyeboten]

I have wondered if the developing pressures during the interior Ballistics phase of a Bullet's acceleration have an imbalanced elasticity or occilation or rebounding aspect, as the Bullet is accelerating?

Gasses have mass...and, may display turbulence, momentum/inertia, elasticity, and regions of differential pressure in circumstances of movement, so...


And, if this is understood or imagined to play a role with respect to Powder type causing it, and, Barrel length, for any given Bullet Powder combination for that Barrel length.


Just wondering...if anyone has any off the cuff knowledge on this.

[RidgwayCO]

Is this in reference to the concept of "detonation", where the powder in the case supposedly explodes rather than burns? This is supposed to be a factor with small amounts of slow-burning powder in very large cases. In my mind, this is just another reason to choose powders that fill at least 50% of the available case volume with maximum average pressures at or below the SAAMI numbers.

I've read about "detonation", but I understand it's never been seen in a lab in anything less than a cannon shell. I think the blown up firearms that have been attributed to this phenomenon are more likely to have suffered a double charge of powder or a barrel obstruction. Just my opinion...

[Afy]

When you shoot a cartridge, it causes the barrel to vibrate due to a combnation of causes, including the gasses, and bullet passing through it.
Some pressure data, and as to when powder finishes burning can be gleaned using software such as Quickload.
Figuring out the accuracy nodes in the barrel virbation can also be worked out using the Optimal barrel time calculations.
Using QL barrel travel times for a given charge and barrel length combined with OBT Node data does yeild good starting points for an accurate load. This typically is in the +/- .2 grain window.
I dont know if this is what you were looking for though.

[ants]

Hornady's old manuals used to have a tutorial on ballistics. I haven't read it in years. Maybe it's still in the book. Or on the web site. Check it out.