My gunlugger has taken the silenced sniper with AP ammo . I know that I can't challenge him directly with NPCs cause he will outright murderbot them which is great . However I do want to bring some challenges that will bring out moves beyond seize by force and sucker someone. So my first thoughts were using vehicles and gangs inside of fortified holds. But since I'm new to system I want to run it by you veterans and see how you interpret AP ammo in these cases.
I don't think the solution is really what you think it is but let's go with your examples first. Here's a couple of solutions.
Ba's stronghold is is a prewar nuclear test observation bunker.
Custom Move: When you are outside Ba's stronghold and Seize By Force of Go Aggro on people inside it, reduce the harm you do by 2-harm.
Also, Ba's got a tank! Not a bus with some steel strapped to it, a motherfucking tank! The tank has a heavy machine gun and a FUCKING TANK GUN. The FUCKING TANK GUN is far, loud, messy, armor piercing, area, clumsy, terrifying 5-harm weapon.
Custom Move: When you seize by force, go aggro etc against the machine gunner, use the regular rules. When you go after the driver and FUCKING TANK GUNner from the outside, reduce the harm done with weapons with the messy or area tag by 2. Weapons without messy or area do no harm.
So that 'solves' your problem but what it really does is create a whole new set of problems. Because if I'm playing the Battlebabe, my new objective is to steal that tank. Once I'm inside it with my 2-harm armor, I'm basically invincible. Or the Gunlugger can take his sniper rifle an shadow the tank on the theory that sooner or later the driver will get out to go to the bathroom. One scene with a lot of rolls that aren't Go Aggro or Seize By Force later, the Gunlugger has a new juggernaut to inflict violence with and you'll have to escalate again.
If you want rolls other than hard based ones to be the solution, come up with problems that can't be solved by hitting them. Murdering Ba still won't make him tell you where Dustwitch is conducting her blood sacrifice ritual with the children of your holding. You can't shoot a drought and make it rain, although I guess you could raid your neighbors for water. Hell, maybe Ba also has a FUCKING NUKE that's wired through some weird psychic shit to blow if he dies.
Custom Move:When you Go Aggro on Ba, he never caves.
If Ba dies, his entire stronghold and everything for 5 miles around it are irrevocably destroyed. Radioactive fallout rains down for 100 miles in every direction for an entire season.
There's a problem you can't Hard your way out of.