Thread: Replacing action bolts

I need longer action bolts for my Rem 700. THe ones i have are too short now. My new stock needs more screw length.

But I can't find proper action bolts anywhere in NZ. So I've got some of the right size, thread and length from an engineering shop specializing in fasteners.

The head isn't exactly right, but it just might fit the countersink in the stock ok.

But these screws are threaded for the full length of the screw, whereas the threads on real action screws start halfway down the shank.

Does anybody see an issue with using full-length threads?