If you're confident in your Swede, pick a good bullet, work up a good, and go for it! I had been loading for a friends Ruger 77 in .35 Whelen. It shot lights out with 225 grain ABs out to 450 yards. With that load he had harvested deer, bear, and moose. He decided to make a guided elk hunt with some friends and they talked him into needing a MAGNUM, so he bought a 300 Win Mag. Since that time he has taken several head of elk and another moose, but none were shot at a ranges that would exceed what his Whelen would have done. If you know the rifle, the load, and your limitations, stick with it. Ask yourself, if I buy a MAGNUM am I going to be personally comfortable shooting beyond the 400 yard limitation that you've set for the Swede.
