Savge 99 rebore ??

[Big Al1]

I have a 1914 vintage 1899 Savage takedown in .303, with a rather poor bore. I was thinking about having it re-bored to .38-55, so my first step is see if the .38-55 feeds through the mag. The round hangs up about half way in the mag. OAL is 2.53 so it's not to long. An empty case fits right in. It seems to hang up at the bullet, but I measured the width of the magazine in that area and it's about .404". Any ideas?? Or should I just forget about it??!!
Would it require a different cartridge guide and/carrier assy.??

I know 99's in .38-55 are rare, if I can make it work I can always get another .303.