Magnum bolt head in a dual port target action

I currently have a dual port target action and I would like to know if the existing bolt head can be removed and replaced with a "magnum bolt head". I'm planning on using a modified 7mm rsaum case to create a cartridge for 1,000 yard shooting and need to know if this would be a direct swap or would additional machine work to the action be required and in conjunction with this will the existing firing pin work or will that need to be replaced as well. Any answers are greatly appreciated.

it is passable.