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CCI400 VS CCI450

Texas Solo

B.S. High Master
I've read the search results, but they don't answer the question.
Is a 450 harder than a 400?
Are dimensions different?
Is the 450 hotter than a 400?

Don't care to hear about Ren 7.5's or any other primers.
Just want to know the difference between the 400 and the 450's
 
C.E.Smith043 said:
View attachment 1641438


Primer Flash Test Photos

6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma...
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Click to expand...
That’s some fine measure on the diameter.
 
Wish someone would update that chart! It's been around forever. Lots of newer names from some manufacturers. May just be new names, could be a few dimension changes?

While working up 6Br data. I started with CCI 400's, had lots of them. Would switch to the 450's as loads got warmer. Noticed with the same exact load, 400's would be starting to flatten noticably, but switching to 450's they were still nice and rounded. So, that tells me they are "tuffer", wether it be thicker cups or a harder alloy I don't know.

Frank
 
fkimble@charter.net said:
Wish someone would update that chart! It's been around forever. Lots of newer names from some manufacturers. May just be new names, could be a few dimension changes?

While working up 6Br data. I started with CCI 400's, had lots of them. Would switch to the 450's as loads got warmer. Noticed with the same exact load, 400's would be starting to flatten noticably, but switching to 450's they were still nice and rounded. So, that tells me they are "tuffer", wether it be thicker cups or a harder alloy I don't know.

Frank
Click to expand...
Thats been my experience and I will always chose 450s over 400s now. Switching to the magnum 450 has never created pressure issues, it simply makes the 400 pressure signs disappear and you can keep working up the load without seeing pressure signs for a while.

Not to derail too hard here, but I am curious about the BR4s and BR2s. They seem to be harder cups than the 400s but are they the same cup as the 450s?
 
C.E.Smith043 said:
View attachment 1641438


Primer Flash Test Photos

6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma...
www.6mmbr.com
Click to expand...
Oops, you already answered my BR4 question....
 
As many have noted - the 450 is a much sturdier primer, capable of higher pressure than the 400's. In respect to the "magnum" notation - you will not necessarily get higher velocity with the 450's over the 400's on a given load. Most primers don't deviate that much in velocity from one brand to another (perhaps 40 FPS +/- in a .223-sized cartridge), an in comparing magnum to non-magnum. Sometimes the "magnum" primers yield LESS velocity than some non-magnum primers - so best to always load down just a bit when making ANY primer changes if you want to be ultra safe.

That said, there are benefits of the 400 over the 450 in certain applications - like a .17 hornet, where they prefer a more sensitive primer. The 450's are what you want if running hot loads, running them in a semi-auto or any larger cartridge using a small primer. Personally, I'd choose the 450 on any load above a mild bolt gun .223. I detest primer leakage which will deface my bolt facers, so unless I am using a particular caliber that favors sensitive primers - I won't use the 400's.
 
From a custom action standpoint, I can go to serious overpressure with a CCI 400 and wreck brass before anything happens to the primer. In the case of a BAT, Borden, Kelbly, etc. action, testing to find the primer preferred by that ignition system is my goal. A CCI 450 gives no further safe pressure headroom.
 
Evan said:
From a custom action standpoint, I can go to serious overpressure with a CCI 400 and wreck brass before anything happens to the primer. In the case of a BAT, Borden, Kelbly, etc. action, testing to find the primer preferred by that ignition system is my goal. A CCI 450 gives no further safe pressure headroom.
Click to expand...
This is exactly what I find. With a tight 0.062 firing pin, I prefer CCI 400. With a stock 700 I almost always have to use CCI 450’s to keep the cratering to a minimum.
 
searcher said:
As many have noted - the 450 is a much sturdier primer, capable of higher pressure than the 400's. In respect to the "magnum" notation - you will not necessarily get higher velocity with the 450's over the 400's on a given load. Most primers don't deviate that much in velocity from one brand to another (perhaps 40 FPS +/- in a .223-sized cartridge), an in comparing magnum to non-magnum. Sometimes the "magnum" primers yield LESS velocity than some non-magnum primers - so best to always load down just a bit when making ANY primer changes if you want to be ultra safe.

That said, there are benefits of the 400 over the 450 in certain applications - like a .17 hornet, where they prefer a more sensitive primer. The 450's are what you want if running hot loads, running them in a semi-auto or any larger cartridge using a small primer. Personally, I'd choose the 450 on any load above a mild bolt gun .223. I detest primer leakage which will deface my bolt facers, so unless I am using a particular caliber that favors sensitive primers - I won't use the 400's.
Click to expand...
Actually for a 17 hornet the best primer is a Remington 6 1/2. That primer was designed for the 22 hornet and i have found it does create a better more consistent load. It is too soft for even a 223

David
 
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