I love BM for the 55gr but Varget is "almost" as good and never shows pressure signs. I have to be careful with BM because MAX creeps up fast and below what Hodgdon shows in their manuals for my Howa 1500 bolt and RRA AR15.
I don't know what's best but for $100 I got the Shooting Chrony F1 and use it for archery and rifle. My fps numbers line up with what others are getting online with identical barrel lengths so I believe it is accurate.