My Nano works best off of Winchester ammo but only JHP. But runs 100% reliable on Hornady critical duty 135 grain.

It will not run on any FMJ, and just forget it if you would like to run 115 grain ( FTE all the time before the first 500 rounds).

Don't give up on it, mine became 100% reliable after I got about 500 rounds down it. A lot of these small guns need some break in time. And a lot of them only like JHP ammo and most of them work best off of 124 grain.