Re: Remington 700 .243 bolt
What are your plans for the gun? If this is a future long range build or something like that, a donor action, I would send the action to a qualified smith like Nathan Dagley and have them fit a PTG bolt to the action. If you are looking for the cheap route for a beat around .243.. then you might be able to find a bolt used on Gunbroker, but as advised above, you will need to have the headspace checked. If there needs to be changes to the headspace, you could end up in a situation where it costs you more money to fix than it would have cost to have a PTG bolt fitted.
Dave