Powder burn rates.

[Nevada Ed]

I recall when Bullseye was rated #1 and WW231 #2 on the progressive burn rate chart. I believe pressure/heat has much to do with how propellant acts relative to cartridge/projectile, case volume, shoulder geometry, free bore ...

I remember when w231 was not on the data sheets, yet.

Bullseye, Gray B, PB, 230P, Top Mark, Unique and the new 700x !

My pappy finally gave up the old powder Horn.

 

[AJ]

Maybe I do not see things as others do. I used the "Burn Rate Charts" to figure out what powders to use in what barrel lengths. In another words I wanted to use Bullseye in a 2 1/2" barreled revolver and 2400 in a 7 1/2" barreled and not the other way around. Quicker burning powders in short barrels and slower burning powders in longers barrels.

 

[DWalt]

This is like attempting to drink from a fire hose, but what is involved in these questions can be found here: https://apps.dtic.mil/sti/tr/pdf/AD0462060.pdf

 

[jem102]

Maybe I do not see things as others do. I used the "Burn Rate Charts" to figure out what powders to use in what barrel lengths. In another words I wanted to use Bullseye in a 2 1/2" barreled revolver and 2400 in a 7 1/2" barreled and not the other way around. Quicker burning powders in short barrels and slower burning powders in longers barrels.

This should help in finding an efficient load as to charge weight.

 

[OKFC05]

This is like attempting to drink from a fire hose, but what is involved in these questions can be found here: https://apps.dtic.mil/sti/tr/pdf/AD0462060.pdf

I first ran across this 1965 manual on "Interior Ballistics of Guns" while doing graduate work on Thermodynamics of Convection in the Atmosphere, which uses very similar Calculus equations, (Equation of State and derivatives, or rates of change) requiring understanding of Integral and Differential Calculus to follow the expansion and cooling of the atmosphere in vertical motion (thunderstorms) and predict the winds and hail potential from a vertical sounding of the air on a given day.

Without doing the work to learn calculus, the turbulent physics of interior ballistics of guns, or violent thunderstorms in the atmosphere are too complicated to understand, and cannot be expressed in the static world of arithmetic or algebra.

That's why we have tested loading charts, safe to use by people who don't really understand interior ballistics; and weather warnings for public use in avoiding tornadoes, hail, and severe winds, for people that cannot analyze a skew-T balloon sounding.

 

[venomballistics]

I'mma gonna" park this right here despite my better judgement in the larger scope of things.
This can get the ignorant noob into trouble if this, the subject matter involved and all manor else about reloading is not fully understood.

However, in the context of this thread, this is a cheap quick and dirty means of taking everyone to the virtual zoo to poke the animals without getting bit.
use of this to go to the real zoo to poke the animals is best avoided without solid understanding of how the zoo really works.
start [Gordons Reloading Tool Community]

 

[smithra_66]

What does powder burn rate tell you?
2.7 grains of Bullseye, #14 on the burn rate chart, is a hotter load tha 7 grains of Trail Boss, burn rate #22.
So how does burn rate relate to performance? Wouldn't volume chang be a better indicator of performances. How does burn rate relate to chamber pressure?

Have you chronographed that? I'd be surprised if what you say is true there.

 

[venomballistics]

Have you chronographed that? I'd be surprised if what you say is true there.

I'd not be ... trail boss and accurate 5744 are specialized propellants for reduced loads. I expect these to act like they are in business for themselves.
These seem to do the job of unique or red dot in things like 45-70 from very old cast lead data, while doing a better job of it.