Options: Yo-Dave kit, Timney and Rifle Basix.
Both the Timney and Rifle Basix will fit the 455 Varmint.
I've played with all three now. Liked all three.
Both the Timney and Rifle Basix allow for finer adjustments to the sear bite.
Your choice. 20 bucks for the Yo-Dave which satisfies many,
100 bucks for a Timney or Basix which show up on competiton rifles.
Not hard to tweak the factory trigger for pull and sear bite,
but requires more time and effort than the drop in triggers.
CZ recalled all the 455 set triggers. I've got one, they can't have it back.
I installed it in my 455 Varmint, the adjustable sear allows for scary low breaks.
Like touch the side of the trigger and it pops.