CCI 41 or 400

Anyone use these primers for their 223/556 reloads? Notice any difference?

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Originally Posted by Tom4411

Anyone use these primers for their 223/556 reloads? Notice any difference?

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I use both. I prefer the 41's since they're specifically designed for semi auto. Harder cup to prevent slam fire. As far as performance, have not noticed a difference.

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Originally Posted by CodySPowell

I use both. I prefer the 41's since they're specifically designed for semi auto. Harder cup to prevent slam fire. As far as performance, have not noticed a difference.

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I'm in the same boat as Cody.
You would be surprise at the number of AR owners that don't know this fact.
I'm also still using some old data with CCI450 primers. Don't see any performance differences.

Are the 41 primers "necessary" for an AR or just recommend. I just made up some ladders for my AR using 400.

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Respectfully I say - - -> You would also be surprised at the number of AR owners that have never (EVER !!) expieranced a slamfire while using "normal" (CCI 400 and etc.) primers.
Stop,wait,let this sink in. --- SAWMAN

Who has experienced a slam fire with a properly seated standard small rifle primer? Anyone here? I have never seen it happen.
CCI #41 primers are made to military specifications. A bunch of hoo-ha about nothing if you ask me.

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Originally Posted by Big Eddy

Who has experienced a slam fire with a properly seated standard small rifle primer? Anyone here? I have never seen it happen.
CCI #41 primers are made to military specifications. A bunch of hoo-ha about nothing if you ask me.

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One slam fire with 400's.
I started with 41's because that's what was recommended when using H335. The combination with 55gr fmjbt is supposed to mimic the XM193 load.

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And my first thought is . . . was that primer seated a little high.
.003" could make a difference I would think. Is the finer workings of the BCG within specs ?? No worn parts ?? None with a manufacturing defect ??
My point is . . . there is a lot of things that could cause or contribute to the cause of a slamfire besides the thickness of the primer. --- SAWMAN

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Originally Posted by SAWMAN

And my first thought is . . . was that primer seated a little high.
.003" could make a difference I would think. Is the finer workings of the BCG within specs ?? No worn parts ?? None with a manufacturing defect ??
My point is . . . there is a lot of things that could cause or contribute to the cause of a slamfire besides the thickness of the primer. --- SAWMAN

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Right, no point muddying the waters with a bunch of what ifs. The original question was, does it make a significant difference using 400's or 41's? And for that I would say no. It's personal preference. Both function perfectly well.

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Yep,and your vels and groups will pretty much stay the same. --- SAWMAN