Propellant burn rate/ explosiveness?
- Thread starter bandit86
- Start date
bandit86
Before desktop computers there was the Powley pocket computer, a slide rule type device for selecting the correct burning rate powder based on the burn rate of DuPont IMR powder for your rifle. To make a long story short it was based on your bore diameter, barrel length and bullet weight along with the "expansion ratio" of the powder.
Today we have Quickload that can show you the pressure curve of a given powder. Below is a lite practice load for my .44 magnum, what I liked was is shows where 100% of the powder is burnt in relation to barrel length. My .44 S&W has a 5 inch barrel and the chart below shows all the powder being burnt at 2.4 inches of barrel length. If I had used a max load of 296/H110 a much slower burning powder a large percentage of the powder would have been burned "outside" the 5 inch barrel and creating unneeded additional "rocket thrust".
But as Ganderite stated you can look at the loading manuals and get an idea of the chamber pressure and velocity and not spend $160.00 for Quickload.
There are many variables on load data, for example if you fed a can of beans to sunray and then yourself, who would produce more fecal debris.
Before desktop computers there was the Powley pocket computer, a slide rule type device for selecting the correct burning rate powder based on the burn rate of DuPont IMR powder for your rifle. To make a long story short it was based on your bore diameter, barrel length and bullet weight along with the "expansion ratio" of the powder.
Today we have Quickload that can show you the pressure curve of a given powder. Below is a lite practice load for my .44 magnum, what I liked was is shows where 100% of the powder is burnt in relation to barrel length. My .44 S&W has a 5 inch barrel and the chart below shows all the powder being burnt at 2.4 inches of barrel length. If I had used a max load of 296/H110 a much slower burning powder a large percentage of the powder would have been burned "outside" the 5 inch barrel and creating unneeded additional "rocket thrust".
But as Ganderite stated you can look at the loading manuals and get an idea of the chamber pressure and velocity and not spend $160.00 for Quickload.
There are many variables on load data, for example if you fed a can of beans to sunray and then yourself, who would produce more fecal debris.
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A pound of smokeless powder contains the roughly the same amount of energy, regardless of its "Burn Rate", it's how it releases that energy that varies greatly.
For example, "Fast" powders can be consumed at much lower pressures than Slow powders (e.g. 10K psi vs, 35K psi). They also release that energy much more quickly than "Slow" powders - peak pressure (complete burn) in a Fast powder might be reached in 0.3 milliseconds vs. 0.6 milliseconds for a Slow powder.
For example, "Fast" powders can be consumed at much lower pressures than Slow powders (e.g. 10K psi vs, 35K psi). They also release that energy much more quickly than "Slow" powders - peak pressure (complete burn) in a Fast powder might be reached in 0.3 milliseconds vs. 0.6 milliseconds for a Slow powder.
I'm glad I read your post twice...............I was going to say your full of beans.
I have to go now I had some spicy Mexican Chili Con Carne With Beans for dinner last night and the expansion ratio is killing me.
bandit86
Before desktop computers there was the Powley pocket computer, a slide rule type device for selecting the correct burning rate powder based on the burn rate of DuPont IMR powder for your rifle. To make a long story short it was based on your bore diameter, barrel length and bullet weight along with the "expansion ratio" of the powder.
Today we have Quickload that can show you the pressure curve of a given powder. Below is a lite practice load for my .44 magnum, what I liked was is shows where 100% of the powder is burnt in relation to barrel length. My .44 S&W has a 5 inch barrel and the chart below shows all the powder being burnt at 2.4 inches of barrel length. If I had used a max load of 296/H110 a much slower burning powder a large percentage of the powder would have been burned "outside" the 5 inch barrel and creating unneeded additional "rocket thrust".
But as Ganderite stated you can look at the loading manuals and get an idea of the chamber pressure and velocity and not spend $160.00 for Quickload.
There are many variables on load data, for example if you fed a can of beans to sunray and then yourself, who would produce more fecal debris.
I'm looking through the Hodgson powders; for 44mag/ 44 special / 44Russian for titegroup and noticed that as the case capacity gets less then the same amount of powder gets a faster bullet with less pressure with less pressure. I'd be curious as to what effect a compressed load would do in the 44 specjal
Rory McCanuck
CGN Regular
- Location
- Middle of Manitoba
I'm glad I read your post twice...............I was going to say your full of beans.
I have to go now I had some spicy Mexican Chili Con Carne With Beans for dinner last night and the expansion ratio is killing me.
So long as it doesn't flash over and "detonate."
