That 55 grain BST is a varmint bullet and is designed to literally explode when it comes into contact with anything. It will work very well if you take neck and head shots but is extremely fragile for a body shot, especially if you hit a shoulder.

I would not use that bullet on a big game animal. Coyotes and smaller it is perfect.

Most any of the 80 - 100 grain bullets will do a very good job on antelope.

Federal makes several.
Blue box there is the 80 grain Speer hot core and 100 grain soft point.
Premium line you have 85 and 100 grain Sierra Game kings, 100 grain partition, 95 grain ballistic tip, and 85 grain Barnes TSX.

Hornady alsomakes several great loads. Starting at the 95 grain SST and down the page.
https://www.hornady.com/shop/?ps_session=29bbcfc593a67e8b8ef2fda6abe019a4&p age=shop%2Fbrowse&category_id=f8cdc21a7d92383f 4cac817fa4c99e7a