BIZZMO
Member
does anybody know of a primer burn rate chart similar to a powder burn rate chart?
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primer burn rate
- Thread starter BIZZMO
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Some load manuals include a sample of the effect on pressure of various primers. This would largely be due to how "hot" the primer is.
I doubt it'd be practical to test primers for burn rate, but some one may have at one time or another. That doesn't mean that other primer batches will be exactly the same. Or that any differences would be significant.
If you're talking small pistol primers, Federal has long been known as the most sensitive. That isn't the same as burn rate.
I doubt it'd be practical to test primers for burn rate, but some one may have at one time or another. That doesn't mean that other primer batches will be exactly the same. Or that any differences would be significant.
If you're talking small pistol primers, Federal has long been known as the most sensitive. That isn't the same as burn rate.
joe44va
Member
I believe it's called brisance in primers. Perhaps Google can help.
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Dead on target. A measure of an explosive's ability to shatter. It's more a measure of pressure rather than burn rate. According to Wikipedia two explosives with differing brisance could burn (explode) at the same rate, but have vastly different pressure effect.
Dead on target. A measure of an explosive's ability to shatter. It's more a measure of pressure rather than burn rate. According to Wikipedia two explosives with differing brisance could burn (explode) at the same rate, but have vastly different pressure effect.
A friend made one with chronographing 12 different primers with a known shooting load. He found with his load, some magnum primers gave no gain in velocity, others did and that when he shot other loads the velocity was not transferable with different cartridges. He preferred Win SR and Remington LR primers but in some cartridges the difference between them was minimal, in others almost 150 fps.
rockquarry
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About ten or so years ago, HANDLOADER magazine did a pistol primer (standard and magnum) comparison using a .357 magnum load fired in a 6" Python. Accuracy and velocity were compared. I don't have the article handy at the moment, but the differences, in most instances, were pretty minimal as I recall.
Well there is the speed at which they burn and pressures given, but.........
there is also the fact that besides "Burn Rate".........
different primers for a load can also, give good or bad groups with
each powder that you use.
Not so much in revolver or pistols but in my rifle loads I have found that CCI will take the back seat to a WLR in some of my loads and in others a CCI Magnum primer is needed for best fps and accuracy.
there is also the fact that besides "Burn Rate".........
different primers for a load can also, give good or bad groups with
each powder that you use.
Not so much in revolver or pistols but in my rifle loads I have found that CCI will take the back seat to a WLR in some of my loads and in others a CCI Magnum primer is needed for best fps and accuracy.
Primer data of questionable value...
You didn't say if you were interested in pistol or rifle primers?
No manufacturer/supplier has such a list. Probably because no standardized test has been established for same?
Power burn rate charts differ because everbody does it a different way making powders appear at different positions in the charts.
Any data formulated would be obsolete the first time the manufacturer changed it's recipe/process, typically unannounced.
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Handloader #248 (Sep-2007) did a test comparing primers for accuracy in the 223.
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The Rifleman's Journal did small & large rifle primer tests.
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Linebaugh did a pistol primer test:
.500 Linebaugh Primer Test
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An old reloading manual (Speer?) once listed this chart:
.
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You didn't say if you were interested in pistol or rifle primers?
No manufacturer/supplier has such a list. Probably because no standardized test has been established for same?
Power burn rate charts differ because everbody does it a different way making powders appear at different positions in the charts.
Any data formulated would be obsolete the first time the manufacturer changed it's recipe/process, typically unannounced.
.
Handloader #248 (Sep-2007) did a test comparing primers for accuracy in the 223.
.
The Rifleman's Journal did small & large rifle primer tests.
.
Linebaugh did a pistol primer test:
.500 Linebaugh Primer Test
.
An old reloading manual (Speer?) once listed this chart:
.
.
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Yes there are "charts" out there. Google "Primer brisance chart"
There are also slow speed photos of the flash produced by different primers. but who knows what lot number or when they were made.??
For your application I doubt you will notice, feel or see any difference.
Primers go bang. The variables in shooting a handgun are so many, the primer is not going to matter very much.
"Technically" the #150 are not a Magnum Primer, try them and see if the "perform" I don't use them nor do I use Enforcer, so not sure how hard it is to ignite that powder, It is close to 2400 and that powder doen't require a magnum primer.
Much debate over primers, hard soft, thick thin whatever,
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DWalt
Member
Primer compositions do not burn in the same sense that propellants burn. Rather they detonate. There is a great amount of very uninformed opinion bandied about regarding the relative "hardness" of different brands and types of primers ("Hardness" seemingly meaning impact sensitivity) but I have never seen any definitive laboratory data in that regard. The primer manufacturers may know but they do not talk about it. Generally, the major distinction between different primers has more to do with their primer cup thicknesses which dictates the chamber pressure range where they are best used, i.e., the main difference between small pistol and small rifle primers is that small rifle primers have slightly heavier cups and are better suited for use in higher pressure cartridges without rupturing. As has been related here numerous times, whether a small pistol or a small rifle primer is used with a given handgun load makes very little difference in ballistic performance. For many years I have used small rifle primers almost exclusively in my .38 Special and .38 Super handgun loads and have not been able to see any difference between them and small pistol primers.
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Indeed....
Primers are explosive, not a burning propellant like powder. I'm thinking that maybe that flame (or jet) temperature/pressure may be a factor.
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If you wnat more information about primers, priming compounds, or even how to make primers, the NRA sells an excellent book called "Ammunition Making" by George Frost . This book tells it like it is in the ammo making industry.
PS You right, I found a bunch of info on Google easy.
Primers are explosive, not a burning propellant like powder. I'm thinking that maybe that flame (or jet) temperature/pressure may be a factor.
====
If you wnat more information about primers, priming compounds, or even how to make primers, the NRA sells an excellent book called "Ammunition Making" by George Frost . This book tells it like it is in the ammo making industry.
PS You right, I found a bunch of info on Google easy.
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nachogrande
Member
WHAT "REALLY" MATTERS.
I recall an article on primer studies, (who knows how old) the gist of it was that temp didn't matter all that much, all were hot enough to do the job. What mattered more was how far the flame was thrown. Sorry no reference for you. I believe Remington primers were at the top of the list. Primer selection would matter much more in long range bench rest shooting, than 10 yard offhand pistol shooting, for me anyway. It also stated the OLD hard/soft primer non issue was a "myth" that never died. (NOT MY STUDY) Don't shoot the messenger.
I recall an article on primer studies, (who knows how old) the gist of it was that temp didn't matter all that much, all were hot enough to do the job. What mattered more was how far the flame was thrown. Sorry no reference for you. I believe Remington primers were at the top of the list. Primer selection would matter much more in long range bench rest shooting, than 10 yard offhand pistol shooting, for me anyway. It also stated the OLD hard/soft primer non issue was a "myth" that never died. (NOT MY STUDY) Don't shoot the messenger.
hdwhit
Member
You should not expect to find one.
All modern primers, with the exception of a few "lead-free" types all use lead styphnate as their active ingredient. Lead Styphante has an explosive velocity of approximately 16,000 fps. That will not change from one size primer to another.
Different amounts of lead syphnate may be used in large versus small or standard versus magnum primers thus resulting in differing levels of "brisance", but brisance does not correlate to burn rates in powder. The explosive velocity of the primer does not change with differing amounts of the active ingredient since it is inherent to the chemical make-up of the lead styphante, not its quantity.
DWalt
Member
There are two distinct types of lead styphnate. Also, many primer compositions contain small amounts of fine powdered aluminum. The aluminum particles act as sparks to ignite the propellant more uniformly.
