I've had better luck with Winchester. The Hornady brass from what I recal was a bit thicker. I definitely had more stretching and had to full length size more with the Hornady, I generally just neck size.

I wouldn't trust your current load in another brand of brass. Doubt you be pushing pressure limits but your accuracy may suffer with a change of pressure. Could always pull some and try your current load for 3 rounds etc before loading the rest. That's if your planning to pull the DC rounds and load your own

As far as just trying the DC loads as is, that be your call. My rule of thumb is I want to know all components and distance from lands etc before I discharge an explosion against my face. I'm sure they're fine but it's just playing it safe