I like .284 also because I'm too poor and too busy to fire form. I just did a .284 F Class rifle, the customer is just getting into it and that's where his mentors guided him. He had his own reamer made by JGS, I wouldn't use a SAAMI 284 Win for benchrest, the freebore diameter is oversized and the neck is too big also for F Class level accuracy. Whatever you decide, if Lapua doesn't make brass for it do not use it for benchrest.