Cci 450

[FLshooter]

I like CCI primers. Pretty much all I use.In 6.5 Grendel loads,I have been using the CCI 400 small rifle primers.Recently I met some guys at the 600 yard range telling me they use CCI 450 small magnum rifle primers for 6.5 Grendel.And I?ve also read a few posts on here of guys using CCI 450 primers.
They were both telling me that they get better velocity.But one of them had a labradar.I glanced at it and I didn?t see a big difference from my numbers.They were using 123 grain ELD bullets like I was.I believe they were using 8208XBR.I use H335.Their groups were not spectacular either.
Right now I wouldn?t be running out right away to buy CCI 450 primers because I just split a case of the CCI 400 w/my buddy. We got a deal at the Melbourne Florida gun show.
But I would still like to know if the CCI450 primers would give me an advantage.

[Mustangfreek]

Not sure about the grendel-not loaded for yet.

But switched ALL my 223.556 plinking and accuracy loads to cci 450’s better across the whole board

[A5BLASTER]

All I have ever used is cci450's so I don't have any data to compare them to any other primer. But they work fine for me in my ar and bolt grendels.

I have cut my loading teeth on the grendel and everything I have learned about loading I have learned from guys on this fourm and a few books I purchased.

By in large cci450's are considered the go to primer for all ar cartridges that use srp.

So that's what I went with and all I use simply to keep from having to stock more then one primer type.

As too your load, if it ain't broke, don't fix it.

[Popeye212]

I've tried Win SRP,GM205M and the CCI450s. The 450's give me better groups and Sd's an velocity. so that is all I use now.

[grayfox]

Primer performance comes down to 2 things for the Grendel. First off, as mentioned above,the choice of a primer - you try for the best firing performance, as in tighter SD's, MVs etc. But more importantly for an AR frame, you need a hard cup primer, and the 400 is not that, it has a softer and thinner cup. Lots of talk both ways as to well I have never seen a slam fire and I use yadda yadda... but for a floating FP bolt it is best to have a primer cup that can withstand that pin striking up against it.
That's where the cci450, cci41 and Fed 205AR come in. I think the WSR also but don't use them. Maybe Rem 7 1/2 too but not the 6's.
For my ARs I use the 450. It does give me good numbers as in SD, ES, MVs, but there is the safety aspect of that harder cup. For bolt action (I had a howa, now a Ruger) I plan to use either the 450 or maybe even the Fed 205. For the Howa I had some loads for each primer. With the bolt action there is no floating pin. For a given powder/bullet/case combo, in a bolt you can pick the one that gives you the best firing.

[grayfox]

The primer is not really about getting the hotter blast or getting an extra 100 fps. It's about getting a consistent reliable firing every time. I once did a small test for myself with cci 200, 250, and Fed 210GMMs b/c I had them all, for 308 and for 6.5 Creed. For those loads the 210GMM had the smallest SD and ES and thus tightest MVs. Being mostly "agnostic" on brands, I use the 210GMMs now for those rifles.

[Popeye212]

The primer is not really about getting the hotter blast or getting an extra 100 fps. It's about getting a consistent reliable firing every time. I once did a small test for myself with cci 200, 250, and Fed 210GMMs b/c I had them all, for 308 and for 6.5 Creed. For those loads the 210GMM had the smallest SD and ES and thus tightest MVs. Being mostly "agnostic" on brands, I use the 210GMMs now for those rifles.

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Strangely enough I use the GM205M in my .223's shows how different rifles react to different combinations.

[Rugerfan.64]

I have ran CCI BR, 450 and 400 across my chrony, as far as MV , SD and extreme spread, there was no difference in the BR and the 450's, as far as accuracy the 400's edged out the other 2. I had a good supply of the 400's and went with them. My small sample may not be the definitive answer but I went with it and have no regrets.

[Klem]

I use 450's from way back when encouraged to do so by fellow long range F-Class shooters. Not because the magnum gave more velocity but because the cup thickness was better at holding the pressure without piercing. The 450 is .025" thick whereas the 400 is .020". So with auto loaders it's a seamless choice to want something thick to mitigate the chance of an accidental discharge with a free-floating firing pin.

I started using BR4's for older cases in 6.5x47 where the primer pocket started to widen. The BR4's are slightly wider and shallower than the 450's I haven't seen any noticeable difference in velocity between 450's and BR4's and unfortunately have not tried the 400's. But, I do notice a difference when swapping between small rifle 450 and small pistol for Blackout (unsurprising). They are about 40fps less when using pistol primers.

[Sturmgewehr]

So you are that Klemm?

Found a article write up from about 10+ yrs ago by BR shooter Jerry Tierney for 284 win. He tested each lot of primers some how...
I read it as if some made for a MV outside his specs since he had his loads completely worked out.

[Daveycrockett]

Interesting topic...I too mainly use 400 only because that's what I bought a ton of years ago and never had problems so never tried anything else. I read another post on here somewhere that talked about this and had a chart that showed all the primers and the cup thickness for each which I found interesting.

[1Shot]

I have found over the past 40 years of hand loading that primers DO make a difference in accuracy with specific loads. The only primer that I have ever had a slam fire with was with the M1 Garand my first time out with handloads for it a looooooooooog time ago. It was with Federal 210M. It doubled once and with the next clip it triple fired. Old experienced hand loader and M1 shooter came running down to me yelling cease fire. First words out of his mouth was you can't use Federal primers in the M1. I though, how did he know I was using Federal primers? Then he explained that it was pretty commonly know by most M1 or any free floating firing pin rifle hand loaders that Federal primers are too soft and sensitive to use because of slam fire. I have never tried a Federal primer in these type rifles again. I did witness a fellow have a slam fire with an AR 223 and he was using Federal small rifle. That is the reason that Federal came out with their AR primer. I have used all the CCI primers, Rem 7 1/2, 9 1/2, Winchester large and small rifle, Wolf Large rifle and small Mag rifle primers with no problems in free floating firing pin rifles. In the Grendel I have used CCI 450, BR-4 and Rem. 7 1/2 with no problems. I found loads that I wanted to use to deer hunt with using CCI450s. If it ain't broke I ain't going to try to fix it

Now with bolt rifles it is a different story. I use Fed. 210M in a number of loads. It all depends on the caliber, powder load combo. I have found that CCI 250s work best for me in my 25-06 and 264 Win mag. Wolf LR works best in my 30-30AI Contender 14" barrel pistol. ( I have a cherished stash of them that is used in this pistol only} I usually find a powder and seating depth that works the best with just one primer. Then I back off a little and work back up with a different primer to see which one really does the best. Sometimes primers don't make much difference but other times there is a huge difference. You never know until you give it a try.

[FLshooter]

As too your load, if it ain't broke, don't fix it.

Words of wisdom right there.I am indeed getting very good groups with the CCI400 primers. And at this point I?m not looking to change anything. I am just asking questions and learning.

[delt475]

I only use CCI400s for small rifle loading. Never had a slam fire and never had an issue with them. I have about 15k sitting in my reloading room too. I don?t think I?m switching anytime soon either.

[drewsbow]

I have had slam fire with 400's so I don't use them , BR4's work great for me