I tried it and it was awesome for me (i played 16 games with it)
Bushmaster is mediocre, doesn’t have the firerate of Russian autocannons and doesn’t have the penetration of the Swedish ones. It kind of strikes a middle ground between them, but in War Thunder this doesn’t really work. But, the platforms Bushmasters are mounted on are mostly quite good.
Depends on the bushmaster, most of the 30mm ones are pretty mid though and the problems are more evident on tree like sweden where if you don’t have a remote turret you are essentially worthless as a TD. The 25mm on the bradly imo feel more punchy than the 30mm though it may just be nothing. Regardless i find the 25mm to be a bit better than the 30mm