Primers

[kochie]

Going to pickup some primers tomorrow I have a choice cci 400 & cci 450 any you guys might know which one will work better or both in 22 creedmoor will be using H4350 powder and 75 grain bullets SRP primers & lapua brass

 

[painter]

My choice would be the CCI-450.

 

[Mark611]

I think I would run the 450mag primers over the 400's, in a SRP case, I did a comparison between SRP cases over LRP cases, the LRP's gave me about 60fps over the CCI 450mag SRP, using Winchester LRP's, but comparing the 400 to 450"s I have not done, in my 6.5 Creedmoor, for the 400 vs the 450mag I don't know for sure if the 450's are hotter or not? or if it's just cup thickness? another CCI primer to consider if you want the max from your primer is the CCI #41 it's hotter than the 450's,

 

[kochie]

I think I would run the 450mag primers over the 400's, in a SRP case, I did a comparison between SRP cases over LRP cases, the LRP's gave me about 60fps over the CCI 450mag SRP, using Winchester LRP's, but comparing the 400 to 450"s I have not done, in my 6.5 Creedmoor, for the 400 vs the 450mag I don't know for sure if the 450's are hotter or not? or if it's just cup thickness? another CCI primer to consider if you want the max from your primer is the CCI #41 it's hotter than the 450's,

Thanks don’t think he has any # 41 primers I have use them before and like them hot & strong ,

 

[Bronsin]

The 450's are good primers.

 

[Bill Norris]

I'd go with the 450s on top of that much powder.

 

[Dgd6mm]

I'll say it, CCI four fifties.

 

[quest450]

I'd get both and test

 

[kochie]

I'd get both and test

Ok thanks guys

 

[Laurie]

Just remember the CCI-400 is a thin-cup (20 thou' brass) mechanically weak model introduced for the .22 Hornet and its 40,000 odd psi pressures. The 450 is a much more robust beast with a 25 thou' cup and likely a tougher brass alloy too designed for modern high-pressure cartridges

Assuming you might run a Creedmoor based number at or near 60,000 psi, avoid the CCI-400, Rem 6 1/2 and one or two other weaker models.

There are no end of threads on this and other forums on this issue and over the years many magazine articles.

 

[kochie]

Just remember the CCI-400 is a thin-cup (20 thou' brass) mechanically weak model introduced for the .22 Hornet and its 40,000 odd psi pressures. The 450 is a much more robust beast with a 25 thou' cup and likely a tougher brass alloy too designed for modern high-pressure cartridges

Assuming you might run a Creedmoor based number at or near 60,000 psi, avoid the CCI-400, Rem 6 1/2 and one or two other weaker models.

There are no end of threads on this and other forums on this issue and over the years many magazine articles.

Ok thanks good information

 

[Hohn]

I’d be content to use #41s in every SRP application for the rest of my life if I had to. It’s the closest I’ve found to a “never the wrong choice” primer. Followed by REM 7.5s, which I’ve used a lot fewer and can’t find anywhere.

 

[Coyotefurharvester]

No 400's in the 22CM. Save your bolt face from damage.

 

[JEFFPPC]

I’d be content to use #41s in every SRP application for the rest of my life if I had to. It’s the closest I’ve found to a “never the wrong choice” primer. Followed by REM 7.5s, which I’ve used a lot fewer and can’t find anywhere.

71/2, been my go to primer when nothing else works for over 60 years. Good call Hohn.

 

[STS]

The 450's is where you want to be. You will probably hear some speculation that SRP's will have hangfires, or outright misfires, in cold weather. I've tested 450's down to 25 below zero, and have never seen a problem. The reports of poor performance in those rifles is probably related to the ignition characteristics of the action rather than the primer.

 

[Hohn]

The 450's is where you want to be. You will probably hear some speculation that SRP's will have hangfires, or outright misfires, in cold weather. I've tested 450's down to 25 below zero, and have never seen a problem. The reports of poor performance in those rifles is probably related to the ignition characteristics of the action rather than the primer.

More likely the powder and case fill than the action… a low case fill of win 760 or N540 can misfire even in the best actions.

 

[Larry Koch]

Does group size come into play when you guys decide which primer?????
Because for me that's the first choice.
Now for a hunting round only, climate becomes a factor. I was lead to believe that Magnum primers has no meaning. Just like a magnum cartridge has no meaning. It's a selling gimmick .
But primer manufactors claim that there mag primers are in fact hotter for cold weather conditions.
The 41 by cci and other's are for ar15, with thicker cups for floating firing pin, and hotter because of all the different conditions they will, or could be used in.

Or this could be all bullshit.

 

[Laurie]

There can be a considerable difference between standard and magnum performance in the Large Rifle size. There is far less variation in Small Rifle versions.

Here are the results for a multi SR primer test I ran in 308 Win 'Palma' brass. Average MVs give a good indication of the primer's 'brisance' / aggressiveness.

http://www.targetshooter.co.uk/?p=2662

 

[SKWERLZ]

Going to pickup some primers tomorrow I have a choice cci 400 & cci 450 any you guys might know which one will work better or both in 22 creedmoor will be using H4350 powder and 75 grain bullets SRP primers & lapua brass

Absolutely the #450’s
#400 is a good primer but is a bit fragile with a thin cup.
22CM maximum pressure is a good bit higher than the small 22 center fires The #400 used on.

 

[jan x zboril]

Going to pickup some primers tomorrow I have a choice cci 400 & cci 450 any you guys might know which one will work better or both in 22 creedmoor will be using H4350 powder and 75 grain bullets SRP primers & lapua brass

where are you buying primers? thanks