Fighter Weapon Mastery (and Weapon Legend) Question?

[Ares71 Lord of War]

The fighter at 5th level gains Fighter Weapon Mastery and chooses a group of weapons to increase to Master.

Similarly, at 13th level gains Weapon Legend and chooses a group of weapons to increase to Legendary.

If you select something like the Archer archetype from the APG it gives you the equivalent highest proficiency in the Bow Weapon Group.

So at 5th level if you select Sword for your weapon group, both Swords and Bows increase to Master. At 13th level if you select sword, both Swords and Bows increase to Legendary. Is that correct as I am understanding it?

[MEATSHED]

Yeah. It's why gunslinger has singular expertise, so they can't do that

[Ares71 Lord of War]

MEATSHED wrote:

Yeah. It's why gunslinger has singular expertise, so they can't do that

I wonder what other archetypes besides archer do this?

I know some backgrounds or feats that allow certain advanced weapons to be treated as martial. But are there whole other weapon groups?

[The Raven Black]

Search on pre-Remaster AoN with "expert or greater" gives several feats such as :

Explosive expert feat for bombs and firearms

All Ancestry weapon expertise feats for relevant weapons

Mauler dedication feat for 2-handed and 2-hand trait weapons

Performative weapons training feat for the bo staff, dueling cape, spiked chain, sword cane, and whip

Pirate weapon training feat for hatchet, rapier, scimitar, and whip

And several other such feats.