[Astilla Prime] doing what its made for

Shot into the ground close to enemies and watch them fly

Riven here is purely for Reload Speed and Damage normally i would go with either Vicious Spread or Blaze or Primed Ravage or Hunter Munitions or Chilling Reload
So whatever suits you

Today 2021-06-18 (idk if this mod existed before or not since i dont follow warframe that much) baro had [Primed Tactical Pump] 100% Reload Speed
And believe me or not there is not much difference between PTP and that Riven

Idea of [Astilla] is to make high damage from each shot and not spit ur ammo like crazy for higher DPS
I tested it and going for anything more than [Accelerated Blast] is just stupid
You waste ammo (since slug needs to travel) shooting more bullets than you need reloading more often than necessary
So Riven with Damage + Reload Speed is best option here