As mentioned before, I think that playing a song that contains what you’re looking for is a good idea.

You could also use the terms “harder articulation” and “softer articulation” to describe a desired effect.

Shots can be tough to play. You need to move a lot of air through the horn in a very short period of time (requires a lot of diaphragm support) and you have to control the flow of air out of your mouth (requires a lot of embouchure support). You also have to get the tongue out of the way quickly. Some guys seem to be naturals at it but I think that it takes a lot of practice.

I think that it would be tough for a trumpeter to work up his/her chops enough to “blast the top part” over a band when they only practice at rehearsals. Again, some guys are naturals but I think that you’ll have to use your judgment as to whether your horn player can pull it off.

Best regards. (Hope I didn't say anything wrong.)