CCI400 vs Rem 7 1/2

[mattri]

What are folk's experiences between these 2 primers?

Loading for a 6.5 Grendel on a bolt platform for a local 600 yard match.

Don't have access to other primers so just interested in the 2 above.

Thanks, Matt.

 

[L.Sherm]

On a Grendel case I would go with 7.5's

 

[mattri]

Thanks, how come?

 

[Walt Krafft]

I have always used 7 1/2s. Thats what I had. I have not used any cci primers in the last 30 years. I forget what turned me off about them.

 

[HTSmith]

The Remington 7 1/2 is "tougher" and will stand more pressure in my experience. If it was an either or decision I'd go with the Remingtons. Try both?

 

[Kracken McGraw]

Remington has a thicker cup and a hotter flame. If you have a good action with a a small firing pin with hole to match you may want to try both to see which shoots smallest.

 

[Northridge]

If your able I would shoot them head to head in some pressure ladders to document there general mannerisms…. Likely there will be a clear winner …

Shawn Williams

 

[6MMWASP]

7.5's seem to withstand pressure better than 400's.

 

[mattri]

Remington has a thicker cup and a hotter flame. If you have a good action with a a small firing pin with hole to match you may want to try both to see which shoots smallest.

Interesting, hadn't heard that about the rems before, thanks.
Yes would love to shoot both but unfortunately not able to.

 

[Murray Brook]

The CCI 400 was designed as a primer for low pressure rounds such as the 218 Bee, 22 Hornet, etc where as the Rem 7 1/2 can withstand the higher pressure of bolt action rifles. Keep in mind that a pierced primer can play havoc with your trigger and even damage it as well as etch your bolt face.

 

[bozo699]

The CCI 400 was designed as a primer for low pressure rounds such as the 218 Bee, 22 Hornet, etc where as the Rem 7 1/2 can withstand the higher pressure of bolt action rifles. Keep in mind that a pierced primer can play havoc with your trigger and even damage it as well as etch your bolt face.

100% spot on Murray!….This makes me happy that someone besides myself knows what a 400 primer is for.
Wayne

 

[Rsadams]

I use CCI srp for .223 don't be surprised that at even a middle of the road charge that they flatten... You have to look at other pressure signs in an automatic than a flat primer...

 

[tommeboy]

100% spot on Murray!….This makes me happy that someone besides myself knows what a 400 primer is for.
Wayne

been trying to tell this for years. But no one listens. Especially the AR guys.

 

[bozo699]

been trying to tell this for years. But no one listens. Especially the AR guys.

Yes they should be using 41’s
Wayne

 

[kris bassett]

100% spot on Murray!….This makes me happy that someone besides myself knows what a 400 primer is for.
Wayne

I use 400's for my 17 hornet pretty much exclusively.

 

[Coyotefurharvester]

The 6.5 grendel with light weight bullets and starting load charge weights is right at the 40,000 psi rating of the CCI400. Most loads for the 6.5 g run 20% higher psi than the 400's recommended max. I personally wouldn't use CCI400, Rem 6.5 or Fed 200 . All my cartridges exceed the 40k psi spec.

 

[Straightshooter1]

What are folk's experiences between these 2 primers?

Loading for a 6.5 Grendel on a bolt platform for a local 600 yard match.

Don't have access to other primers so just interested in the 2 above.

Thanks, Matt.

The CCI 400's cups are thinner than 7 1/2's making them more susceptible to piercing under certain circumstances. And from my experience, I find the 7 1/2's I have are actually more consistent.

 

[Evan]

I have a Borden BR that prefers 400. My BRL prefers 450, but shoots 7.5 pretty well too. I find the ignition system in a rifle has a unique preference that seems to hold across many barrels.

I have run colossal pressure with the 400, but thats in a full custom BR rifle with an ideal firing pin fit and protrusion, with painstakingly assembled ammo. I can’t speak to how they perform in off-the-shelf stuff.

 

[mattri]

Awesome info guys, thanks.

Have a line on some 400s and/or 7 1/2s. Can buy the whole lot, all of the 400s or all of the 7 1/2s but not some of both to try.

Appreciate the replies, Matt.

 

[distinguished]

been trying to tell this for years. But no one listens. Especially the AR guys.

When they have to start replacing firing pins and bolts, that will get their attention. Add Winchester to that too! I learned the hard way!