Your Problem is that RCBS dies are just not very good. I find a 4 die Lee set (FL, Collet, Seat and Crimp produces superior ammo to any RCBS 2 die set.
As tested on the Hornady runout tool and on the range.

If you want to get very serious, a Redding set of competition bushing dies just can't be beat.

That Savage will shoot bugholes, if you feed it top quality ammo.

Try 53 gr Sierra bench Rest HPs. Accurate and deadly on small varmints.