Long action bolt head

[brianlt21]

What is needed to convert a 284 long action to 7mmmag bolt heads and baffles

[darkker]

Punctuation is important... I'll assume you are asking if you need a new head and baffle.

No on the baffle, if things were originally meant to be long action; only one baffle for all long actions.
Bolt head as you can see from your loading manuals, showing the case head differences.

[brianlt21]

Ok so I could convert my new magnum bolt head with parts off my old bolt head

[geargrinder]

Ok so I could convert my new magnum bolt head with parts off my old bolt head

Yes, but I prefer to keep my bolt heads complete and ready for use in case I want to swap back.