.22/.25
You will need the #A100 cap for the Challenger Pro.
https://donnyfl.com/products/aea-357-challenger-pro-adapter-m14x1-25?_pos=2&_sid=7540a89bc&_ss=r
I recommend the Ronin .22/.25 1/2x20 #S15 for the Challenger .22.
https://donnyfl.com/collections/ldc/products/2-x-6-5-inch-ronin?variant=41534539588
.25/.30
You will need the #A100 cap for the Challenger Pro.
https://donnyfl.com/products/aea-357-challenger-pro-adapter-m14x1-25?_pos=2&_sid=7540a89bc&_ss=r
I recommend the Ronin .25/.30 1/2x20 #S18 for the Challenger Pro .25 and .30 . This will fit the adapter in the link above.
https://donnyfl.com/collections/ldc/products/2-x-6-5-inch-ronin?variant=41534539652
.25/.30
option 1
You will need the #A99 adapter for the Challenger Pro.
https://donnyfl.com/products/aea-challenger-pro-adapter?_pos=2&_sid=68ad8097f&_ss=r
I recommend the Ronin .25/.30 1/2x20 #S18 for the Challenger Pro .25 and .30 . This will fit the adapter in the link above.
https://donnyfl.com/collections/ldc/products/2-x-6-5-inch-ronin?variant=41534539652
option 2
You will need the #A99 adapter for the Challenger Pro.
https://donnyfl.com/products/aea-challenger-pro-adapter?_pos=2&_sid=68ad8097f&_ss=r
I recommend the Shogun .25/.30 1/2x20 #S25 for the Challenger Pro .25 and .30 . This will fit the adapter in the link above.
.357
You will need the #A100 adapter for the Challenger Pro.
https://donnyfl.com/products/aea-357-challenger-pro-adapter-m14x1-25?_pos=2&_sid=7540a89bc&_ss=r
I recommend the Ronin .357 M14x1.25 #S21.
https://donnyfl.com/collections/ldc/products/2-x-6-5-inch-ronin?variant=13286078251051