forgot to say it is vartarg-Kindlers own it stands for Varmint/target he was so sure this cartridge could shoot well enough in bench rest as well as a varmint cartridge he fused the two -blokes a genius.
look up Todd kindler an american who formed a lot of 20cal cartridges.his load data is bang on.i had a 20 tactical years ago i got in touch with him he sent me a huge amount of data.if you can get hold of his books they are worth there weight in gold i have on for the .20 cal and .17 cal.after reading his data and books i ended up getting a 14/222 walker yes a 14cal awsome cartridge on the 221 fb case.