Useing one brand of primers can cause slam fires in free floating fire pins?
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Old 05-16-2012, 06:25 PM   #1
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Default Useing one brand of primers can cause slam fires in free floating fire pins?

Ok, I am new to reloading and I know that there are two sizes of primers (large and small) and two primer set ups..(rifle and pistol) along with two strengths (regular and magnum)

So I know that rifle primers have thicker cups which take more force to ignite.. I just seen a you tube video that freaked me out.. It said that some primer brands for rifles are designed for bolt action and do no have a thick enough wall for semi autos with free floating fire pins causing slam fires... (such as a AR15).. Is this true? It has freaked me out out.. I thought all rifle primers in proper size were safe to use on my semi auto weapon..

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Old 05-16-2012, 06:27 PM   #2
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Old 05-16-2012, 08:29 PM   #3
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A slam fire is when the bolt slams into the chamber then the firing pin continues and hits the primer firing the round. It is a dangerous situation because some people might not have the firearm pointed in a safe direction when cambering a round. Slamfires don't destroy the firearm.

Now an out of battery ignition has the potential to do damage, which isn't the same thing.

It could be possible for a case to be not have ejected remaining in the action, whereas it could cause a slam fire out of battery... so yes it is possible, just as I would think improbable.

This guy does a few slam fires on purpose.

It doesn't destroy your firearm, but it is dangerous..
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Old 05-16-2012, 08:40 PM   #4
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so this guy is telling me that there are BILLIONS of rounds of .223 out there that will slamfire? Not sure I believe that one. Sounds like a gun problem more than a ammo problem.

Why would you use a "match" primer to spray targets?
why would you need a Mag primer in a .308??
He didn't test any military rounds to see if they too had dented primers.

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Old 05-16-2012, 08:51 PM   #5
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Quote:
I thought all rifle primers in proper size were safe to use on my semi auto weapon.
James videos pretty much covers the basics of free floating firing pins,soft primers and slam fires. I've personally had one in my SKS rifle but it was intentional as I was testing different batches of primers for that very purpose the rds. were not loaded just primed.

A couple of things to note is that just because you use a specific primer designed for rifles with free floating firing pins doesn't necessarily mean you want have a slam fire using them,dropping the bolt on a chambered rd. not seating the primer fully into the primer pocket or a mechanical malfunction of the safety features built into some rifles can still cause a slam fire.

James has another video on primers and seating

My friend Frisco Pete has an excellent articles entitled A Primer on Primers. It goes into a lot of detail on all the various aspects of primers and there different applications http://www.sksboards.com/smf/index.php?topic=56422.0

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Why would you use a "match" primer to spray targets?
The great majority of Mil-Spec primers are not match grade primers. They either have a thicker or harder cup material which makes them less sensitive to the firing pin strike.

Quote:
why would you need a Mag primer in a .308??
Well that depends most Mil-Spec primer are in the magnum range of primer brisance to begin with the CCI #34 and 41's certainly are and although the Win. LR isn't designated as a Mag. primer it's one of the hottest primer there are. You also have to take into account that in some reloading manuals magnum primer are denoted because of the type powders used ie ball powders,some ball powder ignite readily with a standard primer while other require a magnum primer especially in colder weather. All standard primer are not the same as far as there brisance and neither are magnum primer.
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He didn't test any military rounds to see if they too had dented primers.
Not on that video he was just covering the basics,but I have tested various military rds. and they dimple to one degree or another but not the same as when using soft cup commercial primer.

Here is a bolt drop test I did in my SKS rifle using several different type primers all seated to the exact same depth. As you can see I dont use the CCI BR primer in that rifle.
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Old 05-16-2012, 09:20 PM   #6
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Quote:
Originally Posted by res45

James videos pretty much covers the basics of free floating firing pins,soft primers and slam fires. I've personally had one in my SKS rifle but it was intentional as I was testing different batches of primers for that very purpose the rds. were not loaded just primed.

A couple of things to note is that just because you use a specific primer designed for rifles with free floating firing pins doesn't necessarily mean you want have a slam fire using them,dropping the bolt on a chambered rd. not seating the primer fully into the primer pocket or a mechanical malfunction of the safety features built into some rifles can still cause a slam fire.

James has another video on primers and seating Video Link: http://www.youtube.com/watch?v=AiPu36-M9LM&feature=plcp

My friend Frisco Pete has an excellent articles entitled A Primer on Primers. It goes into a lot of detail on all the various aspects of primers and there different applications http://www.sksboards.com/smf/index.php?topic=56422.0
So if I am using a rifle rated primer and I am loading it correctly (not protruding and flat with correct depth) then I am doing the necessary steps to avoid slam fire (while its still possible that a slam fire could occur,i am not creating any unnecessary safety issues).. Buying one rifle brand over another doesn't significantly increase or decrease chances of slam fire..from your personal experiance..right?
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Old 05-16-2012, 09:26 PM   #7
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By the way, the you tube video on primer pocket depth was very helpfull!

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Old 05-16-2012, 09:42 PM   #8
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Quote:
So if I am using a rifle rated primer and I am loading it correctly (not protruding and flat) then I an doing the necessary steps to avoid slam fire.
That would be correct if the primer your using is one of those considered suitable for use in semi-auto rifle with free floating firing pins.

Quote:
Buying one rifle brand over another doesn't increase or decrease chances of slam fire..from your personal experience..right?
Well that depends on if your talking about the AR style rifle,since I don't reload for one I can't say one way or another if all the various version of the AR's firing pin systems are standard or not,I would think they are but there is always an exception.

As far as my 7.62 semi-auto I can tell you that they are not all standard some dimple the primers more some less but none give me any issues as long as I use a suitable primer and seat it correctly for those type systems. Finding a suitable primer is not really that big of an issue all the major brands make a primer suitable for semi-auto rifles with free floating firing pins.
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Old 05-16-2012, 09:57 PM   #9
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thank for the advice being new to reloading- I find it very helpful haveing access to knowledge from experienced reloaders such as yourself :-)

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Old 05-17-2012, 05:47 AM   #10
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I guess my point was don't use a match primer when all you're going to do is shoot a few paint cans.

point 2, for a semi auto you shouldn't need a mag primer for the powder. I'm pretty sure a Fed-210 would set off BLc-2 anywhere in North America.


But really I get the vid and what it implies, I've never noticed a problem when shooting commercial or reloads in my M-1

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