I own a Tikka T3 lite in 300wsm, my brother owns one in 7mm RM, my friends own multiple and my dad owns one. We all had the same thoughts regarding their mags as you do. But after years of hard abuse, running them over, and even one in particular tumbled down a 250 yard rock ledge (bouncing off rocks its whole way down), all I can say is they are alot tougher then they look. We have yet to have to replace one.
just my 2 cents