FLPrepper, Not trying to argue with you here, but...........
The issue of Ruger Mini 14's working best with Ruger factory magazines is hardly unique.
The Springfield Armory M1A is most dependable using USGI magazines made by Checkmate Industries.
I have found that aftermarket mags for the M1 Carbine are hit-and-miss, as are the el-cheapo $7.99 45ACP mags for a 1911. You want a 1911 mag you can bet your life on, it's going to run $25 - $30 each.
Yes, the Mini 14 barrels, until a few years ago, were thin enough to change point of impact after heavy firing. But, honestly, how many of us are going to be in a firefight?
I'm not picking here, don't mean to offend, that is not my intent.
My Mini 14 stays loaded at the head of the bed with the first 4 rounds Hornady V Max ballistic tip because its most likely use would be against coyotes after my livestock. And it really doesn't matter if it shoots one MOA or two MOA or even four MOA in this situation.