Often thought of taking an old, beat-up 99 and converting it to a 260 Rem. carbine for a woods gun, but in researching it, it does look like the newer guns were made a bit "stronger" for "modern, stiffer" loads - I'm keeping my eyes out for a 308. Not that your 303 doesn't have conversion possibilities, but being rimmed, and older, most modern rimless options are probably out.
I'd ask that over at the forum AWS suggested - also there is a Savage site somewhere out there that I got some info from too - don't recall the name now.
Let us know what you find out.