Cz600 223

DGY

DGY

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I just got that rifle from here on the EE, I was playing around trying to figure out max COAL, reloading book I have seem to be all around 2.2###” and the magazine is plenty long enough for that so I measured the distance to jam with two different bullets, a Speer 70gn varmint that have a really short ogive and the distance to jam is 2.0940” and the other is a 50gn Hornady ECX and that one is 2.1680”… so my concern is do I have a rifle with a really short chamber? What bullets should I use to take advantage of the 2.3200” mag and the 1:9 twist rate barrel) I read a few places that it should be able to stabilize up to 70gn I know it is not a matter of weight but length!)image.jpg
 
Looked at Speer load data for that 70gn bullet and there suggested coal is 2.140” and I’m far from being able to get anywhere close to that. With a .0100” it puts me at 2.0840”….. 🤔
 
COAL is a totally useless dimension for the exact reason displayed in the two different bullets you posted. IGNORE COAL.

The dimensions that are important are mag length and the distance to the lands for the bullet you want to use. That and the amount of the bullet left inside the case neck once you have got the bullet out near the lands.
 
I Dont Care About You said:
COAL is a totally useless dimension for the exact reason displayed in the two different bullets you posted. IGNORE COAL.

The dimensions that are important are mag length and the distance to the lands for the bullet you want to use. That and the amount of the bullet left inside the case neck once you have got the bullet out near the lands.
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I know all of that, but what I’m asking is is it normal to have such a short chamber. The bullet is so deep in the case that there isn’t any room for powder 😂
 
Well just did a search and looked at a dozen places and the only place I can find some is in 500 bulks at Rayn’er shine gunwork…. I don’t even know if it’s legit place. If you guys know of a place let me know.
 
Ok looks like they do have a rift chamber and short throat… so I might be limited to 60gn or less bullets?
So no real point in having a 1:9 twist if you can’t use heavier/longer bullets than 60gn.
 
Is your intention for the rifle hunting or target shooting?
I ask because I’ve used Berger 52gr flat based bullets in a savage L25 and it grouped 5 shots at 675y in 6.25”, which to me was pretty impressive!
Sorry if this is no help but just some info about shorter bullets I hoped you might find interesting.
 
DGY said:
I know all of that, but what I’m asking is is it normal to have such a short chamber. The bullet is so deep in the case that there isn’t any room for powder 😂
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Lighter weight Spitzer bullet would help. The bullet on the left is practically a round nose, so it has the ogive very near to the tip.
 
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A quickn'dirty tool to use as a comparator is a .22 shell, it slips on to the ogive and can be measured with calipers to get a comparison number

1:9 is pretty standard twist for 22 cf like 223 and 22-250, which have been used with 50-55 gr leads forever
more than suitable for 400
 
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Thanks maybe I should just be happy with 55gn and lighter…. I was hoping for a longer throat to ba a lento use up the 70gn bullets that the 1:9 should stabilize w/o problems but I guess it is what it is!
 
I ran into the same issues with my CZ 600 233. Pretty sure its built on a "mini action" or something. Heaviest bullets i could get to shoot well were 69gr Smk. Really good accuracy but I was hoping to use something heavier.
 
DGY said:
I know all of that, but what I’m asking is is it normal to have such a short chamber. The bullet is so deep in the case that there isn’t any room for powder 😂
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How much powder does a teeny 223 require?
;)
Just teasing, hope to learn a little bit from your troubles.
Please do not be offended as again I'm learning reloading again after a long highatous .
Rob
 
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FortHunter said:
I ran into the same issues with my CZ 600 233. Pretty sure its built on a "mini action" or something. Heaviest bullets i could get to shoot well were 69gr Smk. Really good accuracy but I was hoping to use something heavier.
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I know it is a 1:9 twist, and I know that it is not supposed to be great with heavier bullets than 69-70gn, but mine I can’t even load such long bullets because of the short throat, a somewhat long bullets need to be seated quite deep or it just get jammed into the lands.
 
FLHTCUI said:
How much powder does a teeny 223 requires?
;)
Just teasing, hope to learn a little bit from your troubles.
Please do not be offended as again I'm learning reloading again after a long highatous .
Rob
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Not offended I’m just trying to learn my self, it seems silly to have a rifle with a barrel twist that could should handle up to 70gn bullets but they they cut the throat so short that such bullet have to be seated so deep into the case that it seams off, not correct, something wrong…..
 
DGY said:
I know it is a 1:9 twist, and I know that it is not supposed to be great with heavier bullets than 69-70gn, but mine I can’t even load such long bullets because of the short throat, a somewhat long bullets need to be seated quite deep or it just get jammed into the lands.
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Ya same issues I was having. I tried single loading and that wasn't giving me enough room to play with either. My models has a 1:7 twist, so should of been good with the heavies.

You can see below to seat the bullets deep enough to fit in the chamber id end up compressing the load to the point it would dent the bullets. And they also look ridiculous seated that deep(75gr ELDm). TBH, I dont have a solution for you. I ended up switching to the 69gr smk for range practice and developing a varmint load. Dissapointed with
my purchase as I was hoping to shoot the heavies. But it's a good replacement for the savage that was my coyote gun before, and I learned a lesson about the constraints of "mini actions"

1000001283.jpg
 
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FortHunter said:
Ya same issues I was having. I tried single loading and that wasn't giving me enough room to play with either. My models has a 1:7 twist, so should of been good with the heavies.

You can see below to seat the bullets deep enough to fit in the chamber id end up compressing the load to the point it would dent the bullets. And they also look ridiculous seated that deep(75gr ELDm). TBH, I dont have a solution for you. I ended up switching to the 69gr smk for range practice and developing a varmint load. Dissapointed with
my purchase as I was hoping to shoot the heavies. But it's a good replacement for the savage that was my coyote gun before, and I learned a lesson about the constraints of "mini actions"

View attachment 1054169
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I didn’t know cz600 came in 1:7 also.
Just looked out to it and they do on the alpha and what ever other model I wonder why they did make all model with a 1:7 twist it seams weird they went with two different twist rate!!
 
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