The way this thread is going is making it seem like its alot more possible to have a sks slam fire with 5+1 witch is completly WRONG IMO, its just as much possible closing the bolt with he standard 5 rounds loaded. (standard in canada

) Ive had my sks slam fire on me, but not from closing the bolt was second round shot and shot the following round after. after hundreds and hundreds of rounds it has only happened once.
Now to answer the question, looks like some people are having luck, but when i tryed with mine there wasent enough room to compress the 5th round deep enough into the mag to close the bolt, It just dug into the case of the 5th round.
I prefer to load 5, because as mentioned before 10 devides by 2 equaly

haha
Thanks
Dave