Preferred bullet when reloading 6mm ARC & Why

[BehindEnemyLines]

BEL, I got a box of the Sierra 90s primarily to try in my 6x45. I was underwhelmed with them there but think it was more due to fast powders being published for the caliber and not being appropriate for a 90. I ended up using most of them for fireforming ARC brass where they worked great.

Thanks for the heads up SH.  I'll use 'em to get some ARC brass fire formed and get some wear on the new barrel and not get too caught up that I don't get .25" groups with 'em.