Wanting to try hunting pigs at 400m, wanting projectile recommendations.

[Klem]

I'm going to say it if no one else will...You're going to want a larger calibre for 400M pig shooting. I'd stick with your 7mm unless the Grendel is the only calibre you have at the time.

28.5gn of 2206H for the 120NBT at 58mm OAL is a good load. With the CZ barrel length 2208 is also a good choice.