Questions about Reforming Brass: .243 > .260

I have never necked a cartridge up or down. I have a lot of once-fired .243 brass I'd like to neck up for my .260. Is it really just as simple as running the .243 brass through a full length .260 sizing die? Need any special brass prep? Should I lightly lube the inside of the case necks? Would welcome any tips or tricks. Thanks.

I'll let others who know more than I weigh in, but is the 6.5 Creedmoor based on the .308 case? Perhaps so, but the 6.5 CM case is slightly shorter than the .260 Rem, and has a sharper shoulder angle. If you can form 6.5 CM from .308, it's probably more involved than simply necking down.

Edit: No, it's not as simple. Here's a good thread from snipershide on the topic.

http://forum.snipershide.com/snipers-hide-reloading/177727-making-6-5-creedmoor-brass-308-brass.html

Just curious: what advantages do you see in the 6.5 CM over the .260 Rem? I mean why go through the extra steps to form 6.5 CM?

I understand the situation; that's why I asked the question. I saw no real ballistic advantage of one over the other, either. The .260 Rem has a tiny bit more case capacity so, in theory, could be pushed a tiny bit faster--assuming the fastest speed was also the most accurate, which is not at all certain. The 6.5 CM has a sharper shoulder, which might give it slightly longer case life. But given that there is lots of .308 (and in my case, .243) brass around and the process of forming .260 brass is far simpler than 6.5, that was my deciding factor. I was just wondering if you had in mind some other advantage to the 6.5 CM that I had not considered. I will admit that "6.5 Creedmoor" just sounds cooler than ".260 Remington."

A bit late for me to change my mind in any event; already added a .260 Remington Model Seven to the safe and should take possession of my new (to me) .260 custom in a few more days. I bought 100 Lapua .260 cases to start load workup for the custom, 100 rounds of Federal hunting ammo for the Model Seven; planning to use that brass in that gun once the ammo is fired. And I need to start processing some of the hundreds of .308 and .243 cases I have on hand.

Well, the custom I will take delivery of shortly reportedly shoots 1/2 MOA or better with 140 grain Amax bullets driven by 42 grains of H4350. We shall see. I haven't shot the Model Seven yet.