It beats remembering what a Kimber Montana is, and does best, here... it's a featherweight HUNTING RIFLE.
Even if a rail system gave some incremental improvement in group size (compared to Talley LW's) on a 20-lb match rifle, can YOU actually use that extra precision shooting a Kimber Montana? Be honest with yourself. I've put a shïtload of rounds through my 7 WSM Montana and as much as I love the rifle, there are just some limits with such a light rifle and a mere mortal behind the trigger.
That's what I mean by don't overthink this. Talley LW's are a great setup in my experience: are simple, are strong, are very light, and cheap! And I seriously doubt they'll limit anybody in any meaningful way compared to a rail. But the rail setup will cost a lot more, weigh a lot more, and basically goober-up a fine featherweight rifle... for no real reason IMHO IME.
