A heavy roll crimp will aid in that flash, I take it that you are using SPMP's. A faster burning power like Little Gun,N110 and 2400 could also help with that flash. Keeping in mind that H110 & W296 are the same powders. Good luck
Good to know. I load a bunch of 158gr soft lead cast boolits over unique and its the dirtiest ammo i have ever shot, im looking to fix that because a still have a ton of those projectiles and don't want to have to switch to all jacketed or plated.
Jtiv19, Seems there have been several threads concerning powder burn rates, even though it wasn't actually mentioned in your post. Here's the deal .... the best "magnum velocity" results are with a slow burning powder .... meaning it will produce the highest velocity and best accuracy. But slow burning powders are NOT without some minor issues and here's why .... H-110 or W-296 takes about 15" of bullet travel to get a complete burn. Further, all powders require considerable chamber pressure to get a clean burn. With your 5" barrel, obviously a lot of powder did not get burned. Chamber pressure drops to almost nothing once the bullet exits the muzzle so there's no pressure to support a clean burn. As a result, the powder remaining will produce a lot of soot on the gun (your hands too) and create a huge muzzle flash.
Muzzle flash is way over rated .... if you shoot mostly in daylight like most people, muzzle flash is not an issue. At dusk or dark, slow burning magnum powders can create a huge muzzle flash .... the shorter the barrel, the larger the flash. All you have to do to counter the flash is to learn how to blink your eyes at the proper time.
A dirty gun or dirty hands are not a big deal. Most shooters clean their guns and wash their hands after each shooting session. Soot, like what is shown on your GP100, comes off very easily .... just a little powder solvent on a cleaning patch will do it.
SirRuger, It is impossible for a heavy roil crimp to prevent soot or a muzzle flash .... it's just the nature of the beast. The other powders mentioned are also slow burners so expect much the same results.
The point is .... there's no such thing as a perfect powder. If you select a faster burning powder, no doubt it will burn cleaner and have less muzzle flash but you will forfeit velocity and possibly accuracy while developing higher chamber pressure. So it's like the old tuna commercial .... do you want a tuna with good taste or do you want a tuna that tastes good? I'll go for the "tastes good" every time, just as I'll go for better performance and put up with the less significant soot and muzzle flash issues.
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