.177 or .22 caliber for 17 joules??

hello Guys!

Couse it’s my first post in here, I would like to say hello to everyone! 🙂

As regards subject I have a question to those of U who has Talon (in Poland Shadow), but in version driveing on only 17joules…
I’m from Poland and we have here some legal limitation as regards power of air rifles, without any registrations U can have only 17J.
to avoid problems and bureaucracy I want to buy just legal version, like this: http://www.gunpower.org.uk/ (it’s a producer web, so hope it’s not forbiden to link it)

and finally the question 🙂

which version .177 or .22 powered by 17J would U recommend to me?
the idea od Shadow is the recreation, but on let’s say 50 up to 100m distance

any suggestions?

thank U in advance!
and sorry if I’ve done something wrong! 🙂

regs!