i have never used Vihtavuori powders. I do use H322 for some of my loads.
Here is what Brownell's says about
Vihtavuori N130 Rifle Powder is used in many factory loaded ammunition and is ideal for 22 and 6mm PPC Cartridges. It’s also suitable for lighter bullets in 223 Remington loads and straight-wall rifle cases
like the 45-70 Government and 458 Winchester Magnum. Vihtavuori N130 has a burn rate similar to Hodgdon H322 and Accurate 2230."
As for bullets, I would want good penetration on a 300 lb boar. I believe I would use the Hornady Interlock.