Mags I have gotten from Triple K, and I have gotten a few to several for guns for which I could not find factory mags, have been excellent with the exception of one that was obviously flawed when manufactured (that one I exchanged for a good one). I have often read bad stuff about them but my experience has been otherwise. Some of the pistols I bought their mags for were Beretta 950 22 Short, Beretta 1934 in .380, Ortgies pistol 32 ACP, High Standard M-101 Duramatic 22 LR. and I just ordered one for a High Standard Supermatic Tournament in 22 LR after seeing this post with them mentioned. Thanks for the reminder.Them, and tripple k. And hi point.
As for the OP's question, I try to put at least two or three full loads through each new magazine, sometimes more. I do not worry about ammo shortages or costs because my life may some day depend on whether or not the magazine functions properly.