For me the first thing I do is figure out what ammo the gun likes. I have found ( For me) strikers like HST ( everything likes HST because HST is bad ass
) and the first target ammo I try out is usually Blazer Brass or WWB.
Once I have that sorted I start counting. Frankly I don't remember the last gun that had a failure of any kind other than a 1911 or an AR. I had a squib in my P30L because like an idiot I tried to run some Silver Bear through it. Wasn't really a squib though, the case got stuck in the chamber. The Silver Bear was never a consideration I just had some and wanted to get rid of it. Which I did. In the trash can.