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When you come to do it do a normal re-size first with 308 die (assuming you have one) but with expander button removed. Put good chamfer on outside of neck, plenty of lube and size to 7mm. The...

Check your neck wall thickness before and after sizing down. I have found when necking up 6.5-284 brass to 284W that even though I have lubed well the process has introduced a wee bit of neck...

It is marginal whether you need to anneal when necking 308 down to 7mm. I would skip that stage. Maybe anneal after 5 reload cycles. If you are getting no split necks (and you shouldn't) and good...

Don't forget to check/trim overall length 2.01".
Chamfer. Excess length is the issue that will potentially give you the pressure spike as well.