My local guns shops carry 7.62xx39 hunting ammo /shrug.

Im sorry yours dont but its very common around here. The S&B ammo is very popular in some calibers. As someone who has actually bought and used S&B i can say its good quality for the money. As someone who has shot lots of the Speer bullets i can say they are typically very good and perform as designed. The FACT is the OP bought a CZ model 527 but did not mention what model. The FACT is he now has one in 7.62x39 and i have offered good advice in that respect.

It simply does not matter now what is a better caliber or what other models CZ offers at this point.