Sorry, I should have been more clear. Threading for a brake or can is a good idea. Personally, I have no objection to long and/or heavy guns. I'd rather have the velocity of the longer barrel since length doesn't bother me.
.308 ballistics are not great in the wind. I think the cartridge needs all the help it can get from whatever additional velocity is available from the extra length. Cutting barrels short is all the rage, but unless there's some specific need for a short barrel I generally advise against it.