Originally Posted by Gene
The 6.5-284 is .264 bore. To neck up, you will need a .284 expander iron. Lube it and inside of neck liberally. Expand the neck, then size it thru your F/L die. Finally, trim to SAMMI length and fire form. Lapua brass is much better than W=W, so your idea is good.
The new dimension dies from Hornady have a different shaped expander ball that works very good
and can be adjusted through out the entire range of sizes (Small base to neck only and would make
it easy to size the Lapua cases up).
I think you can buy just the sizing die for around $30.00 dollars and make it well worth the money
to keep from ruining that expensive brass.
Then fire form and load with your Forster dies if you have them. Other wise buy a complete set of
the Hornady dies and enjoy.
It will be worth the trouble !!!
J E CUSTOM