Resizing .284 Win. brass to 6.5x284

C

ceylonc

New member
I realize that this may be an idiotic question. I have a 6.5x284 and since day 1 I've been using Lapua brass specifically chambered in this caliber. However, it ain't cheap and I found 100 "new in the bag" Winchester .284 cases at my Sportsman's Warehouse. I'd like to give them a try but have never resized a case from one caliber to another one. I've always just bought cases chambered in my specific caliber & loaded from there.

My question regards resizing. Do I just lube the cases (outside & inside of the neck) and run them up the 6.5x284 RCBS resizing die? Is it that easy to resize the neck from .284 to .264? Is there any other brass prep or procedure I should follow?

Thanks for the help guys!
 
Its very easy to go down .020", just lube the whole case and run it through the size die. Do you happen to know what the neck size is on your chamber? Some custom chambers are on the small side and you might want to check that.
 
I just talked to a technician from Forster 2 hours ago dealing with this very topic. I had resized a batch of fresh Win. brass to 6.5 x 284 and has significant concentricity issues (.010 ave. runout). My friends die (also a Forster) did the rest of the bag with no more than .002 neck run out. They were done with the same lube within a few minutes of each other, so in this case it was a die issue. Forster said that it is not uncommon to have difficulty maintaining concentricity in a single neck sizing, but I have seen and done enough to know that was not the only issue here. They are replacing the die by the way. They had recommended in another phone call to neck turn the brass to reduce concentricity errors due to neck wall thickness.

On that topic he mentioned that Forster is releasing a NEW die specifically for necking down brass for 6.5 x 284 in about 3 weeks. This die will have 2 bushings which will also provide a small amount of shoulder bump during a 2 step necking down process. He is sending a flyer with my die and I cannot wait to see it.

In checking their website just now here is a link to said die. This was not posted a few days ago so it is definitely NEWS. /ubbthreads/images/graemlins/ooo.gif

http://www.forsterproducts.com/Pages/precision_dies.htm
 
+1 on what Jack said about Imperial Sizing Wax for brass forming.

A tiny bit of Imperial gives you good lubricity for the die and brass to work smoothly together, but not too much to cause unneeded shoulder dents, etc.

When I neck 284 Win brass down to 6.5, I also back the FL die off just a "tiny bit" to leave a slight crush fit feel to the brass when its chambered the first time. Like with chambering a normal cartridge in an AI chamber.

The brass will look fully necked down, but by having a slight crush fit you know you haven't accidently pushed the shoulder back on the first few cases you neck down.

-BCB
 
I'm lucky, i have Blaine Eddy's "plate" system with progressively smaller beveled holes drilled in a metal plate, and i run my cases into each hole with a drill press, and it's as sweet as it gets for the wildcatter. It may not be worth messing with tho. if you're not doing a lot of cases of different calibers.
 


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