My 358 Norma is built on a left hand Sako Magnum action w/ a 23" Douglas barrel. I shoot 225 Nosler Partitions and Accubonds and 250 Partitions. For some reason the gun does not shoot the Barnes TSX as well. I get sub moa w/225 Partitions at 2950fps using 69 gr. This IS A MAXIMUM load in my rifle. With 75 gr.H4350 & 250 Partitions, I get 2820 and MOa accuracy. Barrel has a 12 twist. It's been my go to rifle in Alaska for 25 years. Not only does it shoot well, it handles and balances better than any other rifle I have except maybe my LH 375 Ruger SS w/20" barrel.
If you have a custom 358 NM, see if your barrel has been throated. The early Schultz & Larsen and Husqvarna Crown Grade guns were freebored from the factory.
Good luck and enjoy your Norma. It's a great cartridge. Shoots flat and hits hard. What's not to like?
One more thing, if you handload try using 338 Winchester brass and fireform. I think you'll find it is harder and tougher than the Norma brass.

Last edited by sbsmith; 12/30/10.