Hope I am posting this in the right place. I recently came into an AR chambered in 450 Bushmaster, anyone who has one of these know that factory ammo for these is ridiculously priced at around $50 for twenty and the 250gr FTX bullets made for these by Hornady is just as bad at $45 for a box of fifty. So I have purchased a set of dies and some brass and some Bayou Bullets 250gr powder coated cast bullets and will be using Hodgdon Lil' Gun and/or Ramshot Enforcer powder. To get to my question, do you think this bullet will work in this cartridge and what should I set my overall cartridge length at. The bullet length averages at .657/.658.