6MM Creedmoor

[15Tango]

Anybody have one, if so what kind of performance are you getting with it? When my .243 Win. barrel needs to be replaced I'm thinking about rebarreling it in 6MM Creedmoor.

Thanks

Wayne

 

[jamesh]

Wayne,
The 6mm Creedmoor is a wildcat formed by simply necking down the 6.5 Creedmoor case. Case capacity of the 6mm Creedmoor with Hornady brass is identical to 243 Win capacity with Lapua brass. In my 1000yd Light Gun I am running 105 A-max bullets at 3170fps with H4350, (28" barrel) there is a little more room but that is where the accuracy is. Brass life has been good. I expect barrel life to be similar to the 243 Win. At less than 600 rounds I was already seeing a lot of firecracking ahead of the throat.
Because of the barrel life I may go with a 6BR,BRX or Dasher when it is time to replace this one, although it has been shooting well.
I am running a 274 no-turn neck. I tried a .272 but that proved to be a little tight as loaded rounds measure .272.

James

 

[15Tango]

James,

I have a 6.5CM now and was thinking the 6MM CM would be a good alternative to .243 Win as I was assuming I could get the same velocity but with better barrel life and perhaps better accuracy.

It's cool to see you're getting 3170 FPS with a 105 though because I'm getting exactly 3170 FPS out of a 105 with my .243 Win. so at least I wouldn't give up any velocity with the 6MM CM.

I assume you had Hornady make you the dies?

Thanks for the info.

Wayne

 

[jamesh]

Wayne,
For a sizing die I converted a Hornady 6.5 Creedmoor FL die to a Bushing die.
For bullet seating I use a RCBS Competition 243 Win die that I made a 6mm Creedmoor sleeve for.

I also have a 6.5 Creedmoor Heavy Gun. I think that with the new 123 gr Amax bullets performance should be near identical to the 6mm Creedmoor with the 105 Amax but with better barrel life. I have only tried the 140 A-max bullets so far though so at this point it is just speculation.

James

 

[Xedefoplop]

thanks for the info guys. it'll really help me.

 

[brian427cobra]

GAPrecision sells head stamped 6mm Creed brass, as well as factory Hornady dies, I shoot a 6.5 Creed, the Hornady 35 dollar dies surprisingly makes dam good ammo, I really don't like the seating die, but it makes straight ammo, but I'll be replacing it soon with a Redding, the non bushing FL sizing die at first appears to be cheap but after a little polishing I like it.

 

[Cody Richardson]

I jus had one built by GA. I took there recommended load(42.0 H4350 w/ 105 hybrid) touched the lands with it. Bore sited it at 500yards, Took 6 rounds to get in the x ring. Next 20 rounds cleaned a Fclass target with 13 x's....The guy pulling for me said the vertical was right around an inch. I was sold on the round!!! Can't wait to try it at 1k!

 

[jaygorski]

My results mirror james results, 3150ish with 28" barrel, just under 500 rounds, though I don't know if I'm getting any firecracking in the throat. Had Hornady make custom dies, FL & NS, upgraded the Hornady seater with a Forster 6XC Ultra micrometer seater. Shoots 105 Hornadys very well as long as the wind isn't playing with them first. Testing some DTACs next week weather permitting. I'd buy another on tuesday and twice on sunday.

 

[best defense]

Wayne,
The 6mm Creedmoor is a wildcat formed by simply necking down the 6.5 Creedmoor case. Case capacity of the 6mm Creedmoor with Hornady brass is identical to 243 Win capacity with Lapua brass. In my 1000yd Light Gun I am running 105 A-max bullets at 3170fps with H4350, (28" barrel) there is a little more room but that is where the accuracy is. Brass life has been good. I expect barrel life to be similar to the 243 Win. At less than 600 rounds I was already seeing a lot of firecracking ahead of the throat.
Because of the barrel life I may go with a 6BR,BRX or Dasher when it is time to replace this one, although it has been shooting well.
I am running a 274 no-turn neck. I tried a .272 but that proved to be a little tight as loaded rounds measure .272.

James

This is interesting because I cannot get any where close to 3000 feet per second with maximum 243 loads from the books I have. I have one load that uses Reloader 17 that comes close, but it is not in any book that I have found. My barrel is a 1:8 twist, it is a Remington 700 trued action with a Timney trigger and accuracy has never been stellar.

 

[74Bronco]

@op if you got good 243 brass , why not try the 6mm slr or 6mm cm (comp match) guys are seeing 2000 to 3000 rds of useable barrel life , cm = fireforming. slr= run it thru a die and shoot. i run a 6mm slr . with 48g r26 it pushes a 115 vldh at 3200 out of a 27" 7.5 twist krieger. you got 243 brass , i would think your most bang for the buck would be staying with a 243 based wildcat . 6xc dies work for the slr raised .120 or whidden and redding both make 6 slr dies .nothing wrong with the creedmore.

 

[Caleb85]

I have build quite a few 6 Creedmoor's this past year, enough to get me to build myself one, I am running a 7 twist tube, lapua brass, BR4's, 110 gr JLK in front of 45.0 gr of RL26, @3150. Can Consistently stay in at 3"@800 and prints a .417 5 shot group @300 yards.

 

[johnnyi]

I have build quite a few 6 Creedmoor's this past year, enough to get me to build myself one, I am running a 7 twist tube, lapua brass, BR4's, 110 gr JLK in front of 45.0 gr of RL26, @3150. Can Consistently stay in at 3"@800 and prints a .417 5 shot group @300 yards.

What barrel length and freebore are you running for this combo?

 

[Caleb85]

What barrel length and freebore are you running for this combo?

Barrel is 28"
My reamer only has .089 FB so after I chamber it I use a throat reamer to take it to .145

 

[Tommie]

Everyone knows Creedmore cases are made with pixie dust and unicorn horns. Total magic.

 

[rardoin]

Everyone knows Creedmore cases are made with pixie dust and unicorn horns. Total magic.

A jilted 6.5 x47L lover perhaps??? The Creedmore cases may be made with the components you refer to...I don't know as I have no knowledge of that particular cartridge. The Creedmoor cases I have used are made of standard cartridge brass.

 

[Caleb85]

When my suppliers had a shipment of 6.5 Creedmoor lapua brass in, I ordered 1500 pieces! ... I'm good for a while

 

[Kurz]

?

This is interesting because I cannot get any where close to 3000 feet per second with maximum 243 loads from the books I have. I have one load that uses Reloader 17 that comes close, but it is not in any book that I have found. My barrel is a 1:8 twist, it is a Remington 700 trued action with a Timney trigger and accuracy has never been stellar.

This brings up several questions which you don't supply information for.

Who's barrel and what length barrel is on your trued 700?

Which model Timney?

Which powders and which bullet?

The reason I ask is that I have one .243 Win. rifle because I have better cartridges to use but I need a standard .243 Win. for testing purposes. With this rifle I can get a little over 3,100 fps. when using Ramshot Magnum powder in a 28" barrel. If you check their reloading data, you will see that they recommend 2.700" OAL with the 105 AMAX which is the bullet I use. Except I load to 2.800" OAL with mid-range pressure.

Provide some more information and let's see where you can get to safely.

Regards.

 

[Old Tanker]

Is 6mm a good or bad investment now? I can pick up a Ruger Precision for less than $800 at a local shop. Are dies readily available? Want to start going longer distance than my local range can support. Maybe take it to one of the shooting facilities in WY or CO and learn to shoot it from a pro. Going to WY would be going home.