6mm/204 Who had done one?

[AckleymanII]

Looking for some information on this case comb from someone that has hands on experience.

Thanks in advance

 

[Beruisis]

I had a 6x47 Kimber. Same thing.
It was a 14 twist so I was limited tp perhaps no more than 70 gr bullet weight, so you'll probably want a faster twist barrel.

 

[JSH]

I was just looking around at info on this the other night.
I have a bunch of 6mm bullets from 55-75 grains that need to be put to use.

I was looking to see how much gain in velocity there is between a 6TCU and the 6-204. I have shot 6-223 and 6TCU a lot, both are looked over a lot.
Jeff

 

[JohnHenry]

Note posts by stevec.

http://benchrest.com/showthread.php?65397-6mm-204-Ruger&s=8cad0cf3b69394eba877dc703e6f37f2

 

[snert]

Seems like tis was done for years in BR...6x47. so similar that i cn't think the minor differences wold make any notable performance changes.

 

[alf]

Here's a visual of the different 22 caliber cases for comparison:

221 FB - 222 - 223 - 223 AI - 222 RM - 22-204 - 22-204 w/80 VLD - 22 Dasher - 22x47 Lapua

 

[snert]

Nice Alf

So a 6mm-204 increases a bit of powder capacity at loss of neck length to the 222mag. 222M was parent of 6x47. Add in bullet incursion and there really isnt much difference to write home about. So, while not apples and oranges, the comparison of 222magx6mm vs 204x6mm is more like red delicious vs yellow delicious apples.

Do some research on the old BR cartridge and talk to guys with experience with it over on BR central.

 

[MrMajestic]

Throw the 6X45AI in the mix too Parker, 3100 fps with an 80 from a 28" tube. Ran it to 700 yards with great results..

 

[ebb]

Where does the 6PPC fit into this mix? 3100 with an 80 sounds like it should be in there close??

 

[JSH]

Throw the 6X45AI in the mix too Parker, 3100 fps with an 80 from a 28" tube. Ran it to 700 yards with great results..

Is there enough difference in a 6x45AI and the 6TCU to argue over?
In my XP 6x45 and a TC barrel in 6TCU using 70 grain TNT and H335, I saw little difference in speed. Accuracy was great for both. Both were 14" barrels. It has been a while but I think I was running them close to 2800 fps. LC sorted brass for the TCU and WW for the 6x45.

I find them both to be very accurate. I want a bit more speed for some splat factor;-), that and staying with a 223 bolt face and making for easy feeding in a savage build.
I have tossed around the idea of a 6mm-22 Nosler. But am not sure how it would feed with available magazines.
Jeff

 

[JSH]

Where does the 6PPC fit into this mix? 3100 with an 80 sounds like it should be in there close??

To what I have read in articles the PPC ended the BR race of the 223 and 222 mag as a parent case. For a long time the PPC was said to be the perfect case size for the game. Also the thoughts of a shorter fat powder column rather than a longer thinner one as far as ignition.
A good gun smith friend that has now passed had thoughts on the PPC and BR chamberings to the effect of them both being shorter made them stiffer, that making them a better chamber than the longer style. He was extremely happy with the introduction of the short mags.

I myself am wanting to stay with the 223 bolt face, that and I have an ample supply of 223 brass and 204.

 

[ebb]

I understand if you have the 223 bolt face no need in reinventing the wheel. What I like about the 6ppc is there is nothing that hasn't already been seen so if my ppc is having problems there are 200 people that have already seen the problem and know how to fix it.

 

[snert]

Throw the 6X45AI in the mix too Parker, 3100 fps with an 80 from a 28" tube. Ran it to 700 yards with great results..

I shot one that belonged to Fredo, God rest his internet soul, and I loved it. Surprisingly lethal, simple and not too much of anything...

 

[JSH]

So I am seeing the consensus is that a 6TCU and a 6-204 there is not enough to argue over a cup of coffee.

I have an itch for a Savage barrel to run 70 grain and under bullets. I have a pile of 70 grain TNT's and a fair bunch of 65 grain Vmax. I just dont want them to spoil or go bad before I get a chance to use them.

What kind of speeds can I look for?

Jeff

 

[a1712]

So I am seeing the consensus is that a 6TCU and a 6-204 there is not enough to argue over a cup of coffee.

I have an itch for a Savage barrel to run 70 grain and under bullets. I have a pile of 70 grain TNT's and a fair bunch of 65 grain Vmax. I just dont want them to spoil or go bad before I get a chance to use them.

What kind of speeds can I look for?

Jeff

Both cartridges are on the Hodgdon Data page with loads and velocity. Brian.

 

[JSH]

Both cartridges are on the Hodgdon Data page with loads and velocity. Brian.

Yes, and the data on the 6TCU is at least 20 years old.
The data on the 6x47 is old also.
I know it takes a lot of time to work up publishable data, but why keep listing the same old stuff, just to keep the numbers up in your listing. Hodgdon has listed a lot of data for IHMSA cartridges for years, with no "new" powder data.
The 6mmx204 RR is pistol data, and the did not list anything under 70 grain that I saw. I can take a SWAG at speeds, but I was hoping maybe someone had hands on with it in a rifle.

 

[MrMajestic]

Can't say for those as I only run the 80's in Berger persuasion. I use Benchmark and Fredo was using H-322. In that weight I think I would lean towards Fredo. Velocity would be dependant on barrel length and twist, mine is a 28" 10 tw.

 

[JSH]

6-204
Is it as simple as a 204 reamer with a 6mm pilot?

 

[swd]

6-204
Is it as simple as a 204 reamer with a 6mm pilot?

If you have 6mm neck and throat reamers. Yes.

 

[SmokinJoe]

Been thinking about doing something like this with one of my Sako sporters to make a nice low recoil deer rifle. Would use a 9 twist barrel. Seems like it would be a great little deer rifle. AA2200 might be a good powder for some intermediate bullet weights.