There's plenty of loaded RN subsonic stuff out there. PMC and AAC (PSA) both make RN 147 ammo. Back when Action Arms imported Israeli 158grn. FMJ ammo, it was RN. Famously, it had a black-painted tip to be able to visually differentiate it from standard ball ammo. And I think this is a clue.
I theorize that most of the flat-nosed 147 grn. ammo is that profile so as to visually differentiate it from lighter 125 and 115 grn. ball or practice ammo. While not universally true, MOST of the modern weapons chambered in 9x19 (at least in the last 50 years) have been designed to be capable of feeding and functioning with hollow-points. And for those weapons, using a flat-nosed bullet that duplicates the profile of most JHP 9x19 ammo isn't a problem. Even most Uzis eat it up with no problem. In fact, the only weapons in 9x19 that I've ever owned that didn't eat them up are my Mk2 STEN and Radom VIS wz35. (The STEN doesn't even like RN copper-plated Berry's or Xtreme bullets, and often snags their softer surface where the barrel feed funnel mates with the trunnion, depending on the mag I use, so I can only reliably feed true FMJ RN ammo.)
For the above reason, I only use round-nose FMJ projectiles. I've experienced getting my heavy subsonic RN FMJ ammo mixed up amongst some lighter standard ball,...and it is a pain in the ass to have to sort them out when that happens. So much so, I pretty much never keep standard ball on hand anymore, and only have heavy subsonic in inventory,...mostly. In fact, although I considered coloring the noses of all my heavy subsonic projectiles,...because I have a source of nickel-plated 9mm brass for the same price as yellow brass,...I load my subsonics with nickel only, in addition to obsessively labeling my batches when boxed up so they should never get misidentified.
Widener's used to carry the IMI 158grn. FMJ projectile to load yourself. I wish they still did.
