Cleaning up after shooting corrosive ammo is really no big deal, especially with an AK. Simply field strip, spray soapy water down the barrel, swab or follow up with WD-40, wipe out the chamber and wipe off the bolt with a soapy rag, rinse with WD-40, and clean as normal when you get home.
Saigas have chrome-lined bores and are easy to convert to AK-74 format, and many builders use chrome-lined bores in their new AK-74 builds.
At a dime a round, it's hard to beat 5.45x39. Buy it cheap, stack it deep. :)
Another good way to clean up after corrosive ammo is Windex,, it has ammonia it, which cleans out the salts well. I have no worries w/corrosive ammo.
Savage has a great 308 and the prices are good