I have a RCBS Partner electronic scale. I check each time against my Dillon beam scale. It is right on the money eveytime. It does cost around $100.00. I got mine on Ebay for $50.
I run grease on the rails of my XD-9. I've put a close to 10,000 rounds through the gun and have not had a single issue. Great gun. Springfield did the trigger and added a
Bar-Sto barrel. Springfield says not to use grease. What should you use on the rails?
The best thing would be to go to the club on a Saturday when they are shooting an AR match and talk to the shooters. Also see the match director. I'm not sure when the next match is. You can check the web site.