Yes you can use the original screws to line things up but I've never seen anyone use the screws to secure the action for bedding. The problem with using the original screws is that they're just too short to work with. You push your screws or alignment pins through the bottom of the stock and hold them or tape them there so that you can add the bedding and then put the action in the stock. Your action screws will probably be burried in bedding and impossible to use. Get some longer bolts or screws with the right thread. Rem actions use 1/4" -28 and I think Winchesters might be 1/4" -32 (which are hard to find but you can use a tap and make your own threads on a nice long 1/4" bolt that you've sawed the threads from). Then your screws can be placed to stick up several inches above the bedding and are readily accessible when you want to screw them into the action and put the action in the stock. I've always used 1/4" surgical tubing to tie the action down into the stock when bedding. I was taught that this minimizes any chance of stress being placed on the action while the bedding sets. I've also started using Marine Tex epoxy for bedding compound and Johnson's paste wax for a release agent. If you do buy an Acraglass bedding kit, I still would recommend paste wax as a release agent. That release agent that comes with the Acraglass is dreadfull and I've had to use a slide hammer to get my action out several times. Hope I helped.
