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Old 11-08-2017, 10:05 PM   #1
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Muzzle Flash

Today I noticed a lot of muzzle flash from SIG V-Crown JHP 124 gr. I never noticed muzzle flash from Blazer FMJ and similar.

What causes muzzle flash?
Is it desirable?

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Old 11-08-2017, 10:23 PM   #2
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I'm not a reloading expert but basically there are different powders that burn differently. Some are more prone to produce flash. We have members here that can be more specific, maybe someone will chime in. There are some offerings out there for home defense advertised as being "low flash". If you had to fire a pistol in the dark and it were loaded with something that produces a lot of flash it could potentially mess up your vision. For me it wouldn't be desirable to have my nightstand pistol loaded with anything on the flashy end of the spectrum.
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Old 11-08-2017, 10:28 PM   #3
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Muzzle Flash

Thinking maybe flash burns cleaner?
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Old 11-08-2017, 10:39 PM   #4
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The blast and flash are caused by the combustion products of the gunpowder, and any remaining unburned powder, mixing with the ambient air.
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Old 11-08-2017, 11:04 PM   #5
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So does a higher grain ammo cause more flash?
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Old 11-08-2017, 11:57 PM   #6
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Originally Posted by designrs View Post
So does a higher grain ammo cause more flash?
Slower burning powders like HS-6 and others will give a bigger flash and higher velosity Quicker burning like W231 usually complete burning in the barrel. My GP100 using HS-6 and 125 grain SWC is a flame thrower. It all depends on the powder being used.
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Old 11-09-2017, 12:14 AM   #7
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Old 11-09-2017, 01:15 AM   #8
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Originally Posted by Albert.Cairns View Post
Slower burning powders like HS-6 and others will give a bigger flash and higher velosity Quicker burning like W231 usually complete burning in the barrel. My GP100 using HS-6 and 125 grain SWC is a flame thrower. It all depends on the powder being used.
Agreed. If all the powder is consumed prior to the bullets exit then flash will be at its minimum. BUT quality self defense ammo will use a powder with a flash retardant or reducer to help reduce your target indicator and preserve night vision.
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Old 11-09-2017, 10:22 AM   #9
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When I fire the Speer Bonded 185gr +P hollow points for test purposes in the Ultra's it has a large flash ball...if I don't hit the target it will at least catch there clothes on fire.

I say as a general rule less flash = better.
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Old 11-09-2017, 10:45 AM   #10
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Muzzle Flash

Originally Posted by Albert.Cairns View Post
Slower burning powders like HS-6 and others will give a bigger flash and higher velosity Quicker burning like W231 usually complete burning in the barrel. My GP100 using HS-6 and 125 grain SWC is a flame thrower. It all depends on the powder being used.

Makes sense... as the SIG V-Crown publishes velocity specs... high velocity = slower burning = bigger flash BUT not great for night vision. Thanks!

Last edited by designrs; 11-09-2017 at 10:56 AM.
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