[2019] (Spoiler) The Tribute Hall has become the unofficial Gun Range we have been asking for.

If you have been making Tributes with the various enemies that the statue of Calus sells, you will know that you can summon an enemy of that type and they will not fight back.

You get everything from ammo, damage numbers, rampage stacks if you kill a simulated enemy, as well as surrounded activated if you have 3 active to test numbers. I can already see a base spread sheet for what type of damage can be done to each enemy type if all of them are unlocked.

Note that kill counts and bounties that require kills will not count using the projections, but the adventure in the Ascendent Plane will.