.260 REM v 6.5 Creedmoor?

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mljdeckard

mljdeckard

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I am in the (eternal, never funded) process of building a precision upper for an AR-10. Weight is not an issue for this one, I want it heavy. I had pretty much decided on doing .260 Rem, to be able to keep the same mags and bolt face as .243 and .308, (also being able to form brass from .308,) but I find myself wondering about accuracy and ballistics.

Is there anything so special about the Creedmoor that should make me change my mind? I still have a lot of skill to build before I am really going to maximize the potential of either one.
 
Not really, although personally I would go for the Creedmore just because it's different. It's really just a .260 with tighter tolerances. When it came out you couldn't buy match grade brass in .260 so everyone was having to neck up or down (using .308 or .243 brass) if they wanted to use Lapua (which most of the accuracy nuts want to do).

Doesn't the 6.5 use the same bolt face as the .308 family?
 
You may find some advantage in the slightly shorter creedmoor (more flexibility in seating depth while fitting the mag). Other than that, they're pretty close to the same, with the 260 having a little more case capacity.
 
For an AR-10 it would be the 6.5 creed by far. It was designed exactly for that purpose to be run at mag length with the heaviest of bullets.
 
It's really just a .260 with tighter tolerances.
Click to expand...

exactly which tolerance is tighter?

The 260rem and 6.5 creedmoor are quite different. as mtncreek and Fredo said, the 6.5CM is shorter which is a big advantage in bolt guns as it allows you to seat the bullets out closer to the lands while still being mag length. It also has a 30* shoulder instead of 20*, like most of the benchrest cartridges. And i believe it has a slightly longer neck, but like mtncreek said, less case capacity.

in a bolt gun, i'd go with 260. in a gas gun, 6.5CM is a great choice.
 
.260 will give the advantage of lapua brass if you wanted to use it. Creedmoor will give the advantage of shorter case for more flexibility in seating depth with the longer bullets. IMHO, any potential accuracy advantage will come from the parts used, the person putting them together and some dumb luck.
 
i don't know if it's technically a 'parent' cartridge but I think people used to form 6.5cm brass from 22-250.

you can use regular ar10 mags or pmags, etc
 
I think the parent case is 22-250 (maybe a length issue?). I tried to form a few old lc .308 cases into creedmoor (just using a fl die) and had some folding in the shoulder. The hornady brass is pretty good. If my skills were better, lapua brass would be something I would be interested in, but they are not. :-( A couple hrs ago I tried to shoot a fox @ ~150yds and missed twice.

A creedmoor feeds fine in an ai .308 win mag.
 
i have no idea what that is. TC stand for thompson contender?
 
yes sir.

the 30tc is what the 6.5creedmoor is made out of.
22-250 can also be made(6.5cm)
the 260 and the 6.5cm are both the same cartiridge, i use the encore with a 6.5cm with a 16 1/4" mgm barrel.
 
Ballistically pretty much the same, each having some advantages and disadvantages like brass types, etc.

The last rifle I bought I had the choice and went with .260 just for the fact that if I ever lucked into some once fired .243 or .308 brass. I could convert if I really wanted to.

In my bolt action Savage LRP in .260 I can load 140 grain bullets to the lands with plenty of room in the magazine.
 
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I would not waste your time doing all that prep to form from .22-250. Creed brass is everywhere and reasonable. Is Hornady brass as good as Lapua? No, but it's solid brass that has won plenty of events. Go Creed and never look back.
I'm in the process of building a 6mm creedmoor that will sling 105 hybrids at 3100 from a 24 in barrel. What's not to like?
 
An afterthought of sorts, but have you considered 6.5x47 Lapua? I am still in the load development and shakedown stage on mine, but it shows great promise. Even better, it uses small rifle primers, and Lapua brass. I have yet to chronograph my loads, but I have seen impressive velocities posted by others on the web, and anticipate the same.

I do not know how rough AR 10 actions are on brass, but at a buck ten apiece, a shell shucker might become expensive if the cases are battered or otherwise badly treated during extraction and ejection.

Good luck, and have fun with your new blaster.
 
taliv said:
exactly which tolerance is tighter?

The 260rem and 6.5 creedmoor are quite different. as mtncreek and Fredo said, the 6.5CM is shorter which is a big advantage in bolt guns as it allows you to seat the bullets out closer to the lands while still being mag length. It also has a 30* shoulder instead of 20*, like most of the benchrest cartridges. And i believe it has a slightly longer neck, but like mtncreek said, less case capacity.

in a bolt gun, i'd go with 260. in a gas gun, 6.5CM is a great choice.
Click to expand...
I think the difference between the two is like comparing coke and pepsi. The creedmore has a fancy name which I think makes people want it instead of the plain jane sounding 260. As far as seating the bullet near the lands to me raises pressure and wears the throat out faster. The Lee crimp die to me is the best for accuracy I have used. All seating a bullet near the lands does is make the bullets release from the neck the same time. When you seat bullets you see the different neck tension. The Lee crimp die makes the bullets release at the same time with standard seating depth. I shot 3 shots in the same hole with 308 165 hunting bullets different cheap brass using standard length and crimp die. That group was shot with a man in the pits watching the target and using a radio to talk to us. I loaded for my friends 3 308 target rifles using the same load and they all shot tiny groups. Guys that don't believe it are brought to the range to see the proof.
 
The .260 Remington has well earned reputations as a superb big game hunting cartridge, and for record setting performances on the target ranges. It will still be going strong long after the Creedmore and similar knockoffs have been forgotten. My DPMS .260 is a dazzler at 600 yards.
 
Offfhand said:
The .260 Remington has well earned reputations as a superb big game hunting cartridge, and for record setting performances on the target ranges. It will still be going strong long after the Creedmore and similar knockoffs have been forgotten. My DPMS .260 is a dazzler at 600 yards.
Click to expand...

I see more factory rifles offered in 6.5 creedmoor than I see offered on. 260
 
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