Where did you find the info? I've always wondered, but will keep for future use.
Primer Question
- Thread starter YZ-80
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The site is on the top of the pic I posted up from the screen shot I did. Brian Enos Forums.
That's great info about the cup thickness and what is recommended/not for AR's and nice to have all in one place.
Critter Picker
Well-Known Member
Thanks, I learned something today. Never to old to learn.
Thank you for that table squeeeezee. I was very surprised to see the dimensional variation up to 0.002"! They "feel" a little different on the lever when seating, but i would never have guessed it was so much.
Magnum,
How much crush do you recommend for Federal primers?
Lasiter
Well-Known Member
I was surprised to learn that some (many?) rifles do not have a spring to hold back the firing pin until it is struck by the hammer (like in a 1911).
I learned this when I had my SKS trigger upgraded. The upgrade included a spring for the firing pin, absent from the factory. Then I started building ARs -- no spring. Seems like asking for a discharge when dropped. Can someone expand on the pros & cons of springs here?
basinman
Well-Known Member
Tagging in to hear some feedback on this.
QuietTexan
Well-Known Member
The pin itself doesn't weigh hardly anything (original spec is titanium I believe?), it can't ignite a primer with only it's own momentum. At least a correctly spec'd and seated one. It will dimple a primer, but that's proof that it can't light one off because it for sure hits them.
I'm sure there are exactly 1,397 "what-if's" that could all result in slam fires, but a correctly maintained pin in a correctly maintained carrier in a correctly maintained rifle with correctly specified ammunition... see the trend there?
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Correct. Do not EVER place a round in the chamber and release the bolt. You will have a slam fire. Always from the magazine. ALWAYS.
QuietTexan
Well-Known Member
Ok, apparently I underestimated the power of human.... intelligence
I guess that's a fair what if.Are you saying in an SKS or an AR? It would be a trick to single load a round in an AR.
The AR. It's not that difficult, just tilt the muzzle down and flop one in. Now admittedly few folks would ever do that but it will cause problems due to an increased carrier velocity. Try it with a dummy round.
It was just a public info advert.
It was just a public info advert.
Hugnot
Well-Known Member
Here are some primer & target photos.
The first image is a shot of a CCI 450 (left) and a CCI 41 right. The CCI450 is nickel plate and the CCI 41 brass. There appears to be tiny bit less anvil protrusion on the CCI 41 (brass) than the CCI 450. I have not actually measured the anvil protrusion but plan to do so with a small bunch of primers. I would be surprised to see any variations more than .002 with most less than .001.
The CCI 41 is my goto small rifle primer and I use them in : .20 Practical, .204R, .223, & 6.5X47 Lapua & have plans to use them with a 6mm CM & 6.5 CM that are in the process of being built.
The target shown is a 300 yard group shot with my 11 twist .20P rodent rifle with 40 VMax's, LC 5.56 brass & IMR 8208. I have no plans to discontinue using 41's and hearing other shooters reject them does not cause concern - been using them for years. Big piles of dead rodents of all species - up to 400 plus yards. Some target competitor shooters use 41's in 6.5X47's. Went .1 mrad left after 2 shots on right side & paid attention to detail.
On the slam fire stuff - I never drop a loaded round into a chamber & let the bolt slam home. I have never fired the NRA HI Power course with a .223/5.56 but understand that fast twist AR .223's are used with 77 grain bullets at 600 having rounds that are too long to fit inside a magazine. Is there some type of a "sled"(old past Garand shooter) that will allow single loaded 77 grain bullet round to be safely chambered?
edit: found a sled (Bobsled!) for my AR so I won't waste lots of bullets & can shoot 75 ELDM's way out there. Cost about $50, looks like an AR magazine.
The first image is a shot of a CCI 450 (left) and a CCI 41 right. The CCI450 is nickel plate and the CCI 41 brass. There appears to be tiny bit less anvil protrusion on the CCI 41 (brass) than the CCI 450. I have not actually measured the anvil protrusion but plan to do so with a small bunch of primers. I would be surprised to see any variations more than .002 with most less than .001.
The CCI 41 is my goto small rifle primer and I use them in : .20 Practical, .204R, .223, & 6.5X47 Lapua & have plans to use them with a 6mm CM & 6.5 CM that are in the process of being built.
The target shown is a 300 yard group shot with my 11 twist .20P rodent rifle with 40 VMax's, LC 5.56 brass & IMR 8208. I have no plans to discontinue using 41's and hearing other shooters reject them does not cause concern - been using them for years. Big piles of dead rodents of all species - up to 400 plus yards. Some target competitor shooters use 41's in 6.5X47's. Went .1 mrad left after 2 shots on right side & paid attention to detail.
On the slam fire stuff - I never drop a loaded round into a chamber & let the bolt slam home. I have never fired the NRA HI Power course with a .223/5.56 but understand that fast twist AR .223's are used with 77 grain bullets at 600 having rounds that are too long to fit inside a magazine. Is there some type of a "sled"(old past Garand shooter) that will allow single loaded 77 grain bullet round to be safely chambered?
edit: found a sled (Bobsled!) for my AR so I won't waste lots of bullets & can shoot 75 ELDM's way out there. Cost about $50, looks like an AR magazine.
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cohunt
Well-Known Member
In the mil spec primers-- the anvil is slightly deeper in the primer cup ( as shown in post #14) -- the combo of the deeper anvil and slightly thicker cup are what help prevent the slam fires-- that said, I've never used the milspec primers and also never had a slam fire-- I've even put a round directly in the chamber and sent the bolt home and never seen a slam fire to date
Times 2, exactly with CCI non milspec
