Here is a yt video of the Mauser M03 in 338 Blaser Magnum.
The M03 barrels come in the following calibres;
https://www.mauser.com/fileadmin/user_upload/MAU_Calibers_M03_DE_2015_2016.pdf
Mini bolt head
.222 Rem., .223 Rem.
Standard bolt head
.22
250, .243 Win., 6,5x55, 6,5x57, .270 Win.
7x64...