The 6.5x47 and 260 are almost identical, but I would recomend bushing the firing pin hole on the bolt of the 6.5x47 due to pressures and small primers used.
The 260 can use Lapua brass as well, if I am not mistaken. Just neck down 308 or neck up 243 brass.
The 6.5x47 Lapua is best with the 130gr and the 260 with the 140's, so take your pic.
The 284 is a great round as well. There is some good reading on these calibers on 6mmbr also.
On the 6.5x47L;
Whenever someone suggests you can do as much with less as more, you should first consider them ignorant, then anything you like.
Nothing is free.
A 6.5x47L has significantly less capacity than a 260(+5gr), a 6.5x55(+5gr Lapua), and way less than a 6.5/284(+20gr Lapua). It therefore cannot match their loads to potential.
So when someone says they can get 260 velocities from a smaller 6.5x47L, they are FOS, because whatever you can do to one, you can do with the other. And that includes running extreme pressures, and light bullets..
It might provide your barrel life goal.
However, the reason most shooters using the 6.5x47L neck down to 6mm, is to IMPROVE it's potential.
The case in form is disadvantaged in that it gives up the entire advantage of 26cal.
[QUOTE=lovdasnow;333918]so am i hearing that you can push the 6.5x47 faster than the 260, and also have better brass? QUOTE]
Nope, the 6.5x47 operates at higher pressures than standard .260 loads. (that's one of the reasons it uses the small primer) Jack the .260 up to the same pressures and you will drive the .260 faster because it has more capacity.
Necking up .243 Lapua brass for a .260 is pretty easy, I do it for my 260AI, which isn't one of your options since you ruled out fireforming. I did end up with a lot of doughnuts in the neck that had to be reamed out.
Too bad a .260AI isn't an option for you. It is a pain to fireform the brass, but once it is done there is very little maintenance too do with the cases. I'm on my 4th firing of my brass now and still no trimming. Easily drives the 140's to 2950fps. Just got some new bottom metal that will allow me to seat the bullets out farther than before so I'll see if I can tweak it some more in the off season.
Mikecr: i'm gonna go out on a limb here and say that you don't like the 6.5x47;)
i have been reading a lot and still can't find very good info on barrel life for the 260 or 6.5x47?
some say 2000, others say 3500. that's a pretty big spread
ya fireforming is out. i know myself to well, and i know i don't need any more steps to an already tedious process. i would rather go shoot.
man, i don't know why this is such a tough decision for me. i was getting pretty settled in on the 260, and then just had a long conversation on the phone with a very knowledgeable guy who steered me toward the 6.5x47 pretty hard. i do like the idea of factory lapua brass for the 6.5x47. so that is a pro.
so. what round would perform the best, with good barrel life, from a 22-24" barrel?
Strictly speaking from a load and go perspective the 6.5x47 is a better option. Lapua brass in my experience requires very little prep. It shines with the 123-130gr class of bullets and will run well out of a factory Rem mag which limits you to around 2.825" COL if you want to mag feed.
If you don't mind a little prep you can get good quality brass for the .260 Rem or pay for Nosler brass. (May have said Norma brass in my previous post). I've never used it but I'm told it is fairly soft brass and guys who load it hot don't get many loadings out of it. The few I know loading it to regular pressures are into the double digits on reloads. The .260Rem does have more capacity, but if you plan on shooting 140gr bullets in the standard Rimington mag you do have to seat them pretty deep and loose out on some potential case capacity. If you have an aftermarket mag system it's not as much an issue.
I can appreciate it's a tough decision. I have a short action Rem700 that is itching to be barrelled in one of these rounds as well.