303 factory ammo is made. I checked Cabelas sight - federal P-shok is available in 150gr

PaulB, although I have not tried the tape idea for .303 Savage cases (I have plenty), the idea works very well when using 30-06 cases to make 7.7mm Japanese service cases. I use Scotch, or similar, tape. Can't see any reason it would not work as well for .303.

Ernie