DD,
Read the Accurate Shooter Super LR article a month or two ago. Necking does lead to good things, but I'll likely stick with the present course of a .243, or possibly its improved version, in either a gas-impingement ("gasser") AR or custom turnbolt.

As for those who seem to have their collective panties in a twist over a few sentences of my prose in this thread resembling that of a certain internet forum recidivist, I defer to your obvious sensitivities....