If you want to blast away with cheap ammo, by all means trade your rifle. Mitchells are generally good shooters though.
This stuff is good to go. Save your brass for someone who reloads.
http://ammo.net/prvi-partizan-8mm-am...-prvi-partizan
If you want to add a scope, Sarco still has some of the reproduction ZF39's and mounts in stock, if you care about being "period correct."
Jimro