I have to agree with some of the others, the short mags. are a way for the firearms manufacturers to make money and generate new revenue by generating new magazine columns and publicity. I've read in many places that they don't match up to there reported performance levels. I wish the firearms manufacturers would spend there time and money on improving there production quality standards instead of trying to make shooters believe that these new cartridges do anything differently than any other cartridge does and has done for years. Also think of all the new cartridges that have come out in the last 8 yrs., all the STW rounds, short mags. by Winchester and Remington, and ultra mags. etc... Not all of these rounds will be able to stand the test of time and some or most of these will not even be chambered in new rifles or manufacured in ammo. 10 yrs. from now. If you pick one of these new rounds then I hope you choose well and pick one that will still be around in a few years. Good Luck.