Interesting... I have 1980s-era Kimbers (84s in .223 and .17 Mach 4), and early 2000s era 84M Classics (.243, .308, both unfired and NIB). The 80s era rifles shoot 1/2 MOA with factory ammo (Fed Premium 52gr .223, Nosler 25gr BT in Fireball... yes, I checked the chamber). I have shot other early 2000s 84Ms in .243 and .308 and they shot well. I have heard that Kimber quality took a beating over the past decade... is that what it is? Every Kimber rifle and handgun (1911 clones) I fired shot reliably and well, and maybe a couple of customers had minor handgun issues that we corrected at the shop.
They were beautiful rifles but for the larger, more powerful calibers I preferred the New Haven M70 Classics. Not a big fan of light, heavy-recoiling rifles.