Forming 260Rem from 308 brass

42MTD

42MTD

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Just wondering if anyone is forming 260Rem out of 308 brass?

I have a pail full of 308Win brass and hoping to use it for a 260.

I have read a few articles of guys resizing..308 to 7mm-08 to 260. Once resized would I still need to fireform (COW method) or could I just load and go?‎

Anyone done it? what worked for you?

Thanks‎
 
42MTD said:
Just wondering if anyone is forming 260Rem out of 308 brass?

I have a pail full of 308Win brass and hoping to use it for a 260.

I have read a few articles of guys resizing..308 to 7mm-08 to 260. Once resized would I still need to fireform (COW method) or could I just load and go?‎

Anyone done it? what worked for you?

Thanks‎
Click to expand...

Run it through the 7-08 die, then the 260 die. Load and go. Only possible issue might be thick brass in the neck of the resized cases.

Dave.
 
I don't own a single piece of brass headstamped .260 Rem.

If you use Winchester, Hornady or another thin-walled brand of .308 cases, I have found that it is simply a matter of resizing in the .260 FL sizer, with no other steps, then shoot normally from the very first shot.

Other brands, especially Federal, will work the same way, but can end up having a neck that is too thick and therefore requires turning. The way I determine this is by measuring the resized neck outside diameter with a micrometer. If it mics .293 inches or below, it is good to go. Otherwise, it gets neck-turned down to .292.

I have never seen the need to size down in steps from .308 to .260. In fact, I've sized down from .308 to .243 in one pass, without problems.

Another (and even easier) way to go is to run .243 brass through your .260 FL sizer. Instant .260 case, ready to use. If you go this way, even Federal brass ends up less than .292 in the neck, in my experience, so no need to neck-turn. I have found that you can just load and shoot, but your mileage may vary.
 
Use you're .260 die but put lots of lube on the case and don't try and get it all in one go. Go part way and take the case out and re lube it if you have to, be gentle. My father has made 7x57 out of 30-06 by doing this although there was lots of trimming involved.
 
I've had great success (5 years now) using .243 range found brass for my .260 long range rig and my M700 SPS hunting rig .260. Lots easier to expand that case mouth by another 0.5mm from 6mm to 6.5mm.

I was too lazy to re form piles of my .308 cases and went with the .243. YMMV! Have at 'er!! :wave:
 
Eagleye said:
Run it through the 7-08 die, then the 260 die. Load and go. Only possible issue might be thick brass in the neck of the resized cases.

Dave.
Click to expand...

Dave, what is the benefit to going through the 7-08 die first, then the .260 (other than the obvious smaller step per stroke)? I'm having a .260 Ackley built and I've run 20 pcs of Lapua .308 through my .260 bushing die just to try it out (don't have the AI die yet). The process seemed easy enough. Is it that maybe there's enough force in the single step that it might crank my necks off axis? Or is it simply to reduce material strain? I won't have the rifle until mid July, so I haven't been able to try any of these cases.

Thanks,
Rooster
 
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