How to kill a deathclaw

Use the fat man multiple times. (I wont say where you can find the "ammo" for it because I don't remember). You can buy it at gun runner store

Also you can use the causs rifle (while sneaking and not being detected) to kill a deathclaw. You can buy that in BoS base

Pacienca (from Gun runner arsenal dlc) is also a good weapon aganist a deathclaw. You can get it from Novac's dino souvenir store.

I'd also recommend a Luck 10 build to get caps from gambling more easily.

now you can indefinetly kill a deathclaw

there are definetly more ways to kill deathclaw but these 3 are the top 3 by my opinion.

Also there was that fat man variant that could shoot multiple bombs but I forgot it's name and it was also from GRA dlc.