You may find that the 7.62X39 might have some misfires due to hard primers. I have heard of this occurring in H&R Handi rifles chambered in 7.62X39. Just something to think about. Then again it may be nothing in the Baikal.
Stan in SC
Use the Federal/Remington/Winchester stuff, and not Wolf or Tula, and you won't have any problems.
7.62x39/20 gauge would get my attention pretty quickly, especially if it was on a smaller frame than that 12 gauge version.