Potassium nitrate would add oxygen which would help convert the carbon (graphite) to CO2 and the potassium would form K2CO3 which will not burn upon hitting the air at the muzzle. Besides, carbonates are added for stabilization as they raise the pH, absorbing any free nitrate/nitrite from decomposition. It would ADD fuel to the flash, something opposite of what we want to do. It releases 1/2 mole of H and CO2 upon thermal decomp. I doubt sodium hydrogen carbonate would do much other than causing deposits. If you want a 3 foot tongue of fire from your. 223, any more than 0.20 grain per load does no more. But the flash.īeing a scientist at heart, I experimented. ![]() I couldn't tell any velocity difference in the chronograph. How did I discover this? Someone suggested using graphite to break in the Lee Perfect Powder measure. Put a dusting of graphite into a load for HIGH FLASH. Some lead pistol loads will streak, some of this is due to bullet lube contamination slowing combustion. So, unless you see streaks, it is all burning. Most pistol rounds do it after a inch of bullet travel. Most high-pressure rifle rounds COMPLETELY BURN the propellent after mere inches of bullet travel. ![]() Cartridges with very low muzzle pressures also flash less as the temperature is a function of pressure. Ppropllents with low graphite levels flash less. It is ejected at very high temperatures and when it mixes with air, it burns. This is a powder that due to the lack of oxygen, cannot burn. In most rifle loads, the flash is due to the graphite. This is most common in low-pressure pistol rounds. The ONLY unburned propellent is visible as streaks. If you are getting them, something is wrong with your load. No matter their source, they are burning particles. The "streaks" can be either unburned powder granules or they can be burning pieces of walnut/corncob polishing media trapped in the case. Find an optimal powder for your bullet weight range and barrel length and you will get minimal flash. Use a slow powder with a light bullet in a short barrel (rifle or pistol) and you will get flash. The more unburned powder, the greater the flash. ![]() I'm not saying KeithJ is wrong (or right), what I am saying is the story as I understand it.Ī powder that is too slow to completely burn while contianed in the barrel will generate a muzzle flash. Maybe this is because there are too many variables that dictate muzzle flash to easily compare different powders? ![]() I certainly couldn't find any tables listing all the powders and relative amounts of flash. I'm leaning toward both.Īnyway, the way I found about the VV powders being low flash was searching through various forums. I'm not sure if this particular case is an issue with powder, bullet weight, or both. Both were quite acceptable compared to the huge bright yellow flash that I get with Remington green box 115gr loads. The flash was totally invisible with N340, and about 1.5" in diameter and dull orange with Unique. I found the same thing with 124 gr 9mm loads. Flash was slightly reduced in the 158 gr loads with N340, but I would consider both acceptable. 357 mag loads were with 158 gr bullets, which did a lot to reduce the flash with Unique. 357 mag Unique loads had an enormous flash, mostly out the cylinder gap. I also found that bullet weight has a lot to do with flash as well. It pretty much eliminated muzzle flash in my 9mm and. I switched to VV N340 because I was having flash issues with Unique.
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