Fellows I'm about to neck up brass for the first time, 243 to 260. Anything special I need to know to do it correctly. My press is a Co Ax and the dies are RCBS, the brass will be once fired Winchester. Thanks Greg

I'd make sure it is fired 243 brass, which means the neck is already opened more than say NEW 243 brass...

Secondly, just make sure it chambers in your 260...

I usually size down to 260 from 308 or 7/08 Win Brass... I don't shoot those two cartridges...

I shoot tons of 243...

quote:

Anything special I need to know to do it correctly.

a little ID neck lube and just do it!

A little lube and just do it sounds about right.

I'd anneal. For this I would use Sincalir neck turning expander mandrels .24 to 25 then anneal, the 26 and anneal.

quote:

Originally posted by Fasteel:
Fellows I'm about to neck up brass for the first time, 243 to 260. Anything special I need to know to do it correctly. My press is a Co Ax and the dies are RCBS, the brass will be once fired Winchester. Thanks Greg

One thing I would check is the neck thickness after you've opened the neck up to 260. It may be on the thin side and might not size correctly using a standard sizing die. I have no experience with cases opened up this way.
FWIW

Don

Just polish the expander, lube and try a few. If you run into a problem take care of it. There are a lot of possible negatives but you'll gain more knowledge by experiencing them then you will from neigh sayers trying to ward off the boogyman( The meaning here is that you may be creating a cure for which there is no malady).
It may not be an apples to apples comparative but I've made hundreds of 8mm-06 cases from Mil. 06 brass. roger

Was loading some .270 today so I tried the .270 cases through the 30-06 die.About the same diametral ratio as you're looking at. Smooth as butter, no problem. have at it! roger

I've resized around 2K pieces of new 243 Norma and Winchester/Olin brass into 260. Since I got my 1st 260 in 10/97, the only 260 brass that I've every used came from Remington and Speer factory loads. All of the remaining 10K+/- reloads have been built on 243 cases.

With new brass, my process is to lube the cases with Imperial Wax, including a little wax on the inside of the neck via a q-tip, and run them through a 260 resizing die. After all of the cases were resized, I trimmed them to a uniform length, deburred the primer flash holes, cleaned them and segregated them by weight. Each of my CF rifles, regardless of what it is chambered for, has its own set of cases that are never fired in a different rifle chamber. Most rifles have 100 dedicated cases, while pdog rifles have between 200 and 400 dedicated cases.

Jeff

I've sized up hundreds of Lapua 243 brass to 260 with no problems. Hornady spray in the neck and the Sinclair expander die and you're reaady to go. I've never annealed and I get 10 to 15 reloads before I just get tired of the brass and start over.

Good luck.