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![Powder Burn Rate Chart Powder Burn Rate Chart](http://www.thegunmag.com/wp-content/uploads/2015/09/HL-Rate-chart.jpg)
Burn Rate Chart. More than 260 powders listed from fast to slow. The chart of relative quickness of powders below is intended as a guideline only. Powders within three lines of one another are similar in relative quickness but cannot be directly substituted without due regard for safe reloading procedures. Burn Rate Chart. More than 260 powders listed from fast to slow. The chart of relative quickness of powders below is intended as a guideline only. Powders within three lines of one another are similar in relative quickness but cannot be directly substituted without due regard for safe reloading procedures.
![Chart Chart](/uploads/1/2/5/7/125738342/176032311.png)
11-05-2007, 09:09 PM | #4 |
Senior Member Posts: 1,021 | How do you know a powder is 'too slow'? IME, it seems to be not only variable by loading density, but also by general pressure range...maybe. Before the manuals had much data on W-W WAP, I tried to work up a .357 Mag load with it using 125-gr bullets. It's a low-flash powder, good for 9mm and .40 S&W, and a few sources put those only 5,000 PSI/CUP/Piezo or whatever pressure units less than some other sources put the .357 Mag. Worth a try, right? From my 4-inch, I got pressure signs and beginnings of sticky extraction at about the same velocities you'd expect from a 9mm load--well, maybe 50-75 fps faster since it was 125-gr and not the 115 like I usually loaded in 9mm. Now Power Pistol, on the other hand, runs a lot faster for me in the .357 Mag, same bullets are 200+ faster and don't stick a bit. But they do flash pretty good...not as good as WW-296, but close. The chart puts Power Pistol faster than WAP. Maybe so up to 33,000 PSI, but above that, WAP seems faster to me. However, I don't 'know' without pressure data. The sticky case pressure thing works only for Magnum pressures anyway but is even then a crude yardstick. As far as the gas guns go, I won't take anyone's word of powder 'xyz' being too slow for the M14-type unless they also give me some port pressure data. I've seen scarcely a peep on that, but I do 'know' what the design parameters are, and I'm confident that any powder between IMR 3031 and IMR 4064 is OK--in .308 at least. |