I rang up my local firearms dealer yesterday for some 505 Gibbs 600 grain round nose / soft nose and some FMJ rounds . Made by Norma and available for pickup on Monday . Doesn’t appear to be a problem getting this ammo in Brisbane Australia . Only issue is the price - A$30/ round ! Still a lot cheaper than 600 NE - the Kynoch ammo was A$200 per round years ago .I might be wrong but, at least a couple of months ago norma at the Swedish website listed cases and loaded ammunition for the Gibbs.
Best regards Peter