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I thought all rifle primers in proper size were safe to use on my semi auto weapon.
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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?
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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.
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why would you need a Mag primer in a .308??
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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.
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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.
Useing one brand of primers can cause slam fires in free floating fire pins?
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