Necking up 6.5x284 Lapua brass to 284 Winchester

[Dennis]

What expander die is required to neck up 6.5x284 Lapua brass to 284 Winchester?

Or do you use an expander mandrel with your normal die?

I know they recommend using the expander mandrel first, then FL size your brass with your 284 die!

Just need the correct process

[tinkerer]

???

They do make 284 win brass.

But if you must, it can be done, anneal first for best performance.

Larry
Tinkerer

[barrel-nut]

PM sent

[geargrinder]

???

They do make 284 win brass.

But if you must, it can be done, anneal first for best performance.

Larry
Tinkerer

Lapua makes 284win brass? Since when?

[Artpro]

Dennis. Expanding 6.5 to 7mm should be a simple pass in the 284 die set which has a tapered button. Several die makers have them available. You're only taking it out .020 inch, or 10 thousands per side.
Art

[Eric in NC]

Dennis. Expanding 6.5 to 7mm should be a simple pass in the 284 die set which has a tapered button. Several die makers have them available. You're only taking it out .020 inch, or 10 thousands per side.
Art

+1 - tapered expander and lube the inside good. No problems with half a mm. No need to aneal or anything. Check length and you might want to trim them a little bit even if they aren't too long just to square the mouth up.