Danger but good advice
I have a yugo 56 and isreali grenades normal blanks in 7.62x39 will work if tou open them and double the powder levels
I am not recommending this to the faint of heart or any one at all I simply works for me, I also use to do this in the army with the sapper grappling hooks and two 5.56 blanks
once again NOT RECOMMENDED