Since you're looking for economical, but don't want the low volume concerns you have with Titegroup, get what you can find of W231/HP38, AA#5 (the one I'm currently most experienced with and have had good success w/9mm and .40) or Power Pistol. AA#5 seems pretty forgiving. Power Pistol was fine, but seemed to have more muzzle flash (anecdotal on my part, but it was more noticeable to me). It was out of a gun of similar size barrel as your G19.
I think, like others said, there are a lot of options and most will serve your stated need of just taking friends out to the range and to save on factory loads during panic buys. If you're looking for defensive projectile loading and care about velocities with regards to lack of penetration/expansion, then might want to do more research/testing before you buy a bunch of one powder.
I had decent consistency out of several pistols with 5.9gr AA#5 over 124gr plated projectiles (Raniers in this case, but have also done similar with the powder-covered lead projectiles such as Gallant 125gr bullets). Your mileage may vary. Good luck...
I think, like others said, there are a lot of options and most will serve your stated need of just taking friends out to the range and to save on factory loads during panic buys. If you're looking for defensive projectile loading and care about velocities with regards to lack of penetration/expansion, then might want to do more research/testing before you buy a bunch of one powder.
I had decent consistency out of several pistols with 5.9gr AA#5 over 124gr plated projectiles (Raniers in this case, but have also done similar with the powder-covered lead projectiles such as Gallant 125gr bullets). Your mileage may vary. Good luck...