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Hi guys, I am looking at maybe doing a 6mm/.204 ruger. I have heard of a 6x47 (not the lapua) which I think is the .222 mag case necked up, the .204 is the same case with the shouklder moved forward so there should be more powder capacity. Any thoughts?

Cheers

Steve
 

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If you mean a 6mm Remington case necked to 204 your going to be burning a lot of powder behind a 20 caliber bullet and end up with the same problem the 22-243 has. Exceptional short throat and barrel life.

One of the reasons the 204 Ruger works is your burning small amounts of powder from a 222 mag case necked to 20 caliber. What your talking about sounds like a good idea, but I really feel your going to be spending money on a loosing project. I think if you like the 20 caliber idea, and I do and shoot a 204, you'd be better served just going to the 204 Ruger.

If your talking about necking up the 204 Ruger to 6mm I haven't seen that done, but it should work fine, though I'd probably just go a 243 and save the gunsmithing costs and obtain higher velocities with a stock cartridge. I shoot one of those as well as the 204.

Are you planning a bench rest gun?
 

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Discussion Starter #3
Sorry if my question didnt come out as I intended. I have and like my .204 ruger, and know of a cheap rem 600 action in .222, and seeing as I have a .17/.223 a .17 Mach IV, a .222, and a .204 ruger, I thought maybe I could do somthing in the 6mm caliber with more legs than a 6x45.

Cheers

Steve
 

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I have a 6x47 Imp which would be the same as you are describing. I have been using 55gr to 80gr bullets in it. cases are easy to form tho it takes a custom die set. good luck with yours.
 

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Jim:
What kind of performance are you getting and where are you getting data? I am very interested in this as I am lokking for something better than the ,223 but on the same basic case.


Regards,
Gene
 

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Contact Wolfe Publishing or find a copy of Wildcats by Wolfe. The 6x47 was a very popular target cartridge in the '70's and '80's with a good number of articles appearing in Handloader magazine. The difference in case capacity between your round and the 6x47 would likely be a grain or less, giving you viable load data and expectations from the old articles. At least your brass will be more available.
 

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Contact Wolfe Publishing or find a copy of Wildcats by Wolfe. The 6x47 was a very popular target cartridge in the '70's and '80's with a good number of articles appearing in Handloader magazine. The difference in case capacity between your round and the 6x47 would likely be a grain or less, giving you viable load data and expectations from the old articles. At least your brass will be more available.
 

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I'll try this again. I started with data from sierra from the 6x47 page and the worked up from there. So far my testing show 100 to 120 FPS faster then max loads from the book. Using 4895[As I have a lot of this stuff] fed205m primer, and the 70 gr sierra blitz king bullet. My rifle has a 1-12 twist as i wanted to go up to 87 gr bullets when I built it but have found it likes the blitz kings best. Seems to buck the wind better than my 223's It easy on barrels and to form and load for. The original idea was to go p-dog hunting with something a little different from the rest of the guys. Fortunately it has worked out better than some of my other wildcat adventures.
 

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Aussiesteve

You might want to check out http://www.bellmtcs.com/BellmChambers/6x50_r_bellm.htm

This cartridge is based on 5.6x50mm cartridge which is just a bit longer than the .222 Rem Mag. The site owner is quite approachable by e-mail and will likely be able to offer some good info for you regarding the 6mm/204.

The cartridge dimensions found at the site below (the most comprehensive I've found on the net; perhaps worthy of a sticky?) maybe of value to you as well. He also has a reloading data page too with data for the 6x47, but I've never looked at it yet.

http://www.stevespages.com/page8d.htm
 

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Steve,

Have you considered building a 22-204? This has about 2% less powder capacity than the 5.6x50 Magnum. In contrast the 223 Rem has about 10% less capacity than a 5.6x50 Magnum. You'll get about 3500 fps with a 55 grain bullet out of a 24" barrel using Hodgdon Benchmark powder. The tradjectory for this works well. About 1 inch low at 25 yards, zero at 50 yards, 1/2 an inch high at 100 yards, zero at 150 yards, and 1 inch low at 200 yards. So you can hold dead centre on anything between 25 and 200 yards and you'll be within an inch!

Alternatively if you build a 6mm-204 you will get about 3000 fps with H4895 behind an 80 grain bullet out of a 24" inch barrel. Tradjectory won't be as flat, but flat enough for shooting larger animals where the target is not so small. If you sight an inch high at 100 yards you'll be down about 2 inches at 200 yards. In contrast, a 6x45 is down about 3 inches at 200 yards (if sighted 1 inch high at 100 yards).

Matt
 

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6X47 Improved....

This is very interesting...I have been researching a cartridge for a lightweight, economical 6mm (.243) deer rifle, that would have very low recoil, and not sound like a clap of thunder when it goes off, just something that will comfortably plunk em' behind the front shoulder and kill em' without ruining half the meat. (I am strictly a meat hunter) (and Varmint hunter :)

This is what I came up with.... :

.222 Remingtion Magnum cartridge "Improved' by blowing it out to a 40 degree shoulder with a .250 neck length (enough for a .243 bullet), and going to less body taper, about .009 ....

this gives you roughly the same or slightly more powder capacity than the .204 Ruger cartridge, with a longer neck, and with a 1-12 twist barrell 23-24 inches long, it should be well able to reach 3100 ftsnds with a 75 gr bullet, which is the bullet I want to use.... at that velocity, the ballistics work out as such :

Ballistics Table in Yards :

75gr Hornaday V-Max 75 gr., .330 B.C.

Range (yards) .... Muzzle ........50 ..... 100 ..... 200 ..... 300 ..... 400 .....500
Velocity (fps) ....... 3100 ....... 2954 .. 2813 .....2544 ....2290 ....2051 ...1827
Energy (ft.-lb.) .... 1600 .........1453 ...1318 .....1077 ....873 ......700 ....556
Trajectory (100 yd. zero) ........-0.3 ......0.0 ......-2.9 ...-11.1 ....-26.1.... -49.3

and yes, I know there are many bigger .243 caliber rifles out there, I just want something smaller...with this cartridge in a good bolt gun, I would have a decent walking Varmint rifle, and a legal deer rifle in the same rifle, with the same bullet....and yes, I know the limitations of a 75gr. V-max, and am prepared to pass the "improper" shot.....

this would work for me, now all I need is rifle, dies, another scope, etc......so much fun, so little time.... :)
 

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oloutlaw, you have just deascribed the 6x47 Imp. Mine weighs in at 6.5 pounds with scope and bullets. 24 in barrel and seems to shoot the 70 sierras better than the others. Its easy on powder, my shoulder, and my ears. So far have only shot varmits with it but given the right shot it will take deer also. Seems to tip yotes over at 300 and a little more just fine. Hornady made my dies for me at a fairly resonable price.
 

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yep, the 6x47 improved is where I want to start....it has a .287 inch long neck tho, and I thot why not shorten that up a bit ? if a guy drilled it on out a bit (the chamber that is) , out to where you only had .250 inch neck left, that would give a good bit more capacity I think..... .037 is a lotta room, especially with a 40 degree shoulder.....mebbe not such a good idea, that would require special dies...... mayhap someday...... :)
 

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Aussie Steve

I've been playing with the 204 case for about 5 yrs now and started with a 25-204, then a 22-204 and finnally this past summer a 6mm-204.

25-204 Built it as a deer/coyote gun, turned out to be a great deer rifle but a little too heavy handed for hunting fur.
100gr NPT 2800fps
85gr NBT 3000fps
75gt HP 3150fps

22-204 Built it on a fast twist barrel to shoot heavies but it turned out to dote on 40's and 50's.
Kills coyotes like lightning and veryeasy on fur with the 40's.
40gr NBT 3900fps
50gr NBT 3700fps

6mm-204 The other two turned out so well I had to see how this one would work. Finnished it last Sept
but do to work load didn't get it over the chrono, then got too sick to hunt with it this winter.
55/60gr 3500/3600fps ?

AWS
 

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sounds like fun to me....I want to just load one bullet in it tho, gettin' lazy in me OL' Age ..... If I can get 3100 ftsecnds outta the 75 gr. V-Max, I would be happiern if I was twins......
 

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6x47 remington imp

I'll try this again. I started with data from sierra from the 6x47 page and the worked up from there. So far my testing show 100 to 120 FPS faster then max loads from the book. Using 4895[As I have a lot of this stuff] fed205m primer, and the 70 gr sierra blitz king bullet. My rifle has a 1-12 twist as i wanted to go up to 87 gr bullets when I built it but have found it likes the blitz kings best. Seems to buck the wind better than my 223's It easy on barrels and to form and load for. The original idea was to go p-dog hunting with something a little different from the rest of the guys. Fortunately it has worked out better than some of my other wildcat adventures.
Jim,how well does the 6x47 remington 40 degree improved feed and function through a factory remington 700 magazine? I have experienced some problems with the 223AI.
 

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Aussie Steve

I've been playing with the 204 case for about 5 yrs now and started with a 25-204, then a 22-204 and finnally this past summer a 6mm-204.

25-204 Built it as a deer/coyote gun, turned out to be a great deer rifle but a little too heavy handed for hunting fur.
100gr NPT 2800fps
85gr NBT 3000fps
75gt HP 3150fps

22-204 Built it on a fast twist barrel to shoot heavies but it turned out to dote on 40's and 50's.
Kills coyotes like lightning and veryeasy on fur with the 40's.
40gr NBT 3900fps
50gr NBT 3700fps

6mm-204 The other two turned out so well I had to see how this one would work. Finnished it last Sept
but do to work load didn't get it over the chrono, then got too sick to hunt with it this winter.
55/60gr 3500/3600fps ?

AWS
Hi, what sort of overal lengths were the .25x204 coming out at?
Thinking of building one and looking at suitable base rifles.

Cheers
 
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