Bought just now this beauty in 10,3x60R caliber (identical to the 450/400 british) still today mandatory for hunting in Grigioni state of Switzerland. While I'm waiting for the courier, I try to find some infos about loading mild ammos for fun at the range. Cases are not a problem cause RWS made them at fair price (2$ each) bullet can be. I'll slug the throat but i'll find something between .413-416 and at the present I have a .433 Accurate mold 330 grs. for Vetterlis. Could this bullet sized down with no harm to lube grooves? Maybe anyone could suggest some reloading tips or data ?