I have a savage model 10 in 308 and a 4 round mag. I have watched you tube and a p mag was used to make a 10 round mag for the model 10. Has anyone done this mod for a 6mmBR and ended up with or without feeding issues. I would like to know before I ruin a mag. The savage mags are impossible to find and if I could which one would work for the 6mm BR?