Sounds about right (Destiny)

by Cody Miller , Music of the Spheres - Never Forgot, Monday, June 16, 2014, 16:16 (3604 days ago) @ RC

In the Alpha you can carry-over your ammo from the same type of weapon when you change it (e.g. shotgun-shotgun, but not shotgun-sniper). So you can actually switch between different Fusion Rifles for different enemies, keep your ammo, and get the correct damage bonus (or avoid a penalty).

That's a huge protip right there, and makes the switching mechanic even better. I did not know this.