6mm on the 222 magnum case

[maddysdad]

this is the case that was used in benchrest shootin before th 6mm ppc.given a 65 grain bullet and the light varmint barrels that they used just how fast will this case drive them .i founf a rifle in this calaber tgat has a hart action and a 19 inch barrel.price is good for such a rifle and i would like to hunt groundhogs with it.i see that the max range will be say 300 yards.thank you for your time

 

[birdog]

Sounds like a great combo. Go for it and let us know.

 

[Oso]

Based on case capacity, the 6mm-.222 Rem Mag cartridge sit right between the 6x45 (6mm-.223 Rem) and the 6PPC.

There is a modern version of your cartridge known as 6mm-204 Ruger, which uses the 204 Ruger case and then necks it up to fit a 6mm bullet. Rumor has it that the 204 Ruger case was based on the .222 Rem Mag case. Do a search on load data for 6mm-204 Ruger and see if you find what you need.

Another option for load data is the 6x45 (6mm-.223 Rem), which was the most popular .222/.223 wildcat used in benchrest shooting until the 6PPC put everything else to bed. There is a lot a load data available on 6x45, which would be a great starting place. The .222 Rem Mag case capacity is just a little more (1-2 gr) than the .223 Rem case.

Aside from 204 Ruger, the .222 Rem Magnum case capacity is close to the 6TCU case, which is basically a .223 Ackley Improved case necked up to 6mm.

Hopefully this helps you find a starting point.

 

[JB10]

I almost buit the 6x47 but finding brass at the time was not looking good. So i went with the 6x45 since i had a lot of 223 brass to work with.

 

[alf]

Back in the day, I had a wore out 6PPC barrel cut back & rechambered to the 6x47 Improved with a 45 degree shoulder by Fred Hasecuster for a prairie dog blaster.

Fantastic round, 55 grain Ballistic Tips at 3300. Finally retired the barrel for the 2nd time with another 9K down the pipe.

The 204 case is a different animal, as the shoulder is moved forward with minimal neck length, increasing capacity over the 222 Mag case.

L to R - 221 Fireball, 222, 223 Rem, 223 Ackley, 222 Rem Mag, 204 Ruger necked to 22.

 

[swd]

I have a 6x45, (6mmx223) but the 204 Ruger necked up to 6mm would be a great choice given brass availability and improved capacity. With a faster twist it’s also a dandy deer round with 95 Partition’s.

 

[17VLD]

If the price is good like you say, I'd get it for that action and shoot a few chucks and see how you like it. Later on you could rebarrel it if needed . The original 6x47 was no slouch and would be a lot of fun for varmints.
Matt

 

[snert]

Load data for 6x47 REMINGTON is available. Look it up in some of the older manuals.

H322 and a 55 grain NBT is a sweet spot.

 

[LCazador]

I still shoot this cartridge in my Remington 40X 6X47 chamber. Amazing accuracy and it's easily a 400 yard plus gun for varmints depending on twist rate and bullets. Nosler is still making 222 Magnum brass and it's best to use 222 Magnum brass not Ruger 204 brass. I use the old Remington 222 Mag brass. Finding dies may be a bit of a stretch but if you can round up a set of Forester bench rest dies they will work excellently.
On some of those old rifles like yours it's best to find out what neck diameter the chamber has before prepping a bunch of brass. Fire one round and measure fired neck diameter before loading anymore brass.

 

[Ackman]

this is the case that was used in benchrest shootin before th 6mm ppc.given a 65 grain bullet and the light varmint barrels that they used just how fast will this case drive them .i founf a rifle in this calaber tgat has a hart action and a 19 inch barrel.price is good for such a rifle and i would like to hunt groundhogs with it.i see that the max range will be say 300 yards.thank you for your time

Sounds like agood one. The 60gr. Sierra HP would be perfect in that, it's unbelievably accurate.

 

[JEFFPPC]

I had a friend with this cartridge in a varmint rifle. I talked him into going to a 200yd score match. Among some good shooters was a fellow with Hall of Fame points. My buddy won. Great little cartridge. I think, this was 30 years ago, he was shooting 748 with 60 Sierra HP.

 

[Boartuff]

I just started working with this cartridge on an Encore handgun configuration with a 14” SSK barrel. I believe it’s going to quickly become one of my favorites.

I’ve got some test loads together with Win748 and 87 gr. V Max, just waiting on proper weather now.

Hornady data below.

https://static.hornady.media/site/hornady/files/obsolete-data/6x47mm.pdf

 

[Bugs]

I have an old 40XBR in 6 x 47 Remington. Messing with brass can be a bit of a pain but, aside from that, it's a great little cartridge. H322 is a great powder if you can find it.

 

[AWS]

I built a 6mm/204 about 20 years ago, great little cartridge. It is the easy button for a wildcat, Redding 204 to bushing die "type S" withe the guts changed out to 6mm. I rechambered a 6x47 Rem barrel. I used it for control work and competition, too heavy handed for saving fur. I changed it to a 20P a couple years ago and have a 6mm ARC now.

 

[AckleymanII]

I have a 6/204 Ruger and shoot the 70g tnt at 3450 fps, amazing accuracy with 24" bbl 14 Twist barrel. I just use Redding S dies and a 204 Comp seater bored out with the chamber reamer.

 

[stacy]

There have been a lot of critters fell to my 6 TCU with H-335 and 75gr V-max it’s just a tough little round it is

 

[Mark W]

Several years ago I bought some .222 brass from another member of the forum. For the sake of discussion, he included a couple of pieces that had been fire formed with a 35 degree shoulder angle. I can’t remember for sure what he said it was called, but .222-35 comes to mind.

I took one of the cases and expanded the neck to 6mm and made a dummy round. My thought was to have a reamer made and use it to shoot 55-70 grain varmint bullets and 65 grain match bullets out of a light weight walking varmint rifle. Unfortunately, I always seem to dream up a lot more projects than I can afford and this one never took off.

 

[JohnHenry]

Following link has some info on the 6mm-204. Note stevec posts in particular.

6mm/204 Ruger

Has such a rifle ever been created, It has occured to me that a custom rifle built on this case would have greater case volume than a 6x47 and put a 223 bolt faced rifle into the realms of the 6PPC and 6BR.:confused::confused:

benchrest.com

 

[JSH]

IMHO, the 204 helped keep the 222 magnum alive.
Load data is not real hard to find. Search some of the IHMSA threads 6,6.5,7mm and 30 caliber were all used at various times.
Don’t expect to find any data listed for “new” powders made after late 80’s to the early 90’s to present day. Hodgdon list several wildcats in their annual, data on some is 30+ years old.

 

[Tommie]

Rumor has it that the 204 Ruger case was based on the .222 Rem Mag case.

Not a rumor