It's very easy to rechamber 7mm rem mag to 7mm stw as long as reciever/magizine is long enough. Why not go all the way to 7mm rum? Same head size,no belt,more powder capacity. Ruger was chambering #1s for stw for a lil while but quit. I think the cartridge is dying and the rum MIGHT be around a lil while longer-or at least case availability.