The fly in the ointment is that when a chamber is throated for the longer bullets, the short bullets can be seated no where near the lands.
Bullets with little bearing surface will only jump so far before they start getting crooked in the barrel and become less accurate.
Another way of thinking of a throat that has been lengthened is that freebore = throat wear.
I would suggest that you get the twist rate and throat dimension based on the bullets that you want to shoot.
There is NO SUCH thing as over stabalizing, a bullet is either stabalized or not.