FYI, SD rounds are going to be very expensive to stockpile. If you do intend to buy them to stockpile try picking up a box or two a week. No need to go broke trying to get it all at once unless you just gotta have it now.
You're better off deciding how much you feel comfortable having in total and spending more on fmj ammo for practicing. I typically keep 300-500 rounds of SD rounds for each weapon and then at least 1000+ in fmj for each weapon also. JMO of course.
Not really looking to stock pile just kinda getting peoples opinion on and whether or not i should buy a couple more boxes to use in a SHTF moment. lol or just have some around to gather dust on the shelf