The Sako arrowhead is a Nosler ballistic tip that is made for Sako. If you measure the OAL length of the factory stuff and load to a ballistic tip of the same weight to the same length you will likely get good results.
The powder in the cartridge is unlikely to be available to reloaders and even if it were you should treat such data as belonging to a different batch of powder than the one in the factory ammo.
This is means you would have to work up anyway so you may as well do that in search of a good accurate load than weighing the powder in the Sako stuff.
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