I always thought that the new Sako75' s came with a detachable mag for the ultra mag, till I read more closely. It only comes with a floorplate for the ultra. Their TRG line does come in 30-378 wby with a detchable mag. I think that the 30-378wby has an edge on power over the ultra, but I could be mistaken. Also the Sako TRG comes in 7.82 warbird with a detachable magazine, but you get that one through Lazzeroni.