1) not a thing wrong with button rifleing, All Hart barrels are button rifled.
2) how does hammer forging a barrel put the rifleing in them?
3) I shoot some cartridges that are way more intense than most people shoot and not only do I kiss the lands, some I stick into the lands .012" (enough to pull the bullet on occasion during unloading) think about it like this, pressure will rise but your dealing with more case volume because not as much bullet is in the case. you still need to back off and work up to a max but most VLD bullets shoot best seated into the lands.
I still like remmy but its just a personal preference.