Die question

[mudriver]

I saw this on a previous post and wanted to be sure if I read it correctly. If I use an AR upper I can use most 300/221 dies but if I use an SSK contender barrel as well I need different (hornady) dies?

Thanks.

[ranger dave]

well mr jones is very tight a@#$d about his whisper the only offical dies marked 300 whisper are made by hornaday i got mine 15 years ago at the cost of $84 only game in town at the time but 30/221 or 300 fireball are all the same the whisper is trimed to 1.355 the 221 fireball is 1.4