I would hardly call myself in the know. However, I have used a chargemaster and now use a Lyman 1200 DPS 3. I like the lyman better because it is faster but the RCBS seems very accurate. Charge weights are exactly what I weigh on my Lee Safety Scale, if weighed correctly on the safety scale. It's charge weights are also the same weight that I get on the rice sample scale I use at work. so comparing four scales and all measuring the same weight down to the tenth of a grain says to me that it is pretty accurate. It will do better if you allow it 20-30 minutes to warm up, then calibrate it, and go. I would not be afraid to use it if it was me, but that is a judgement call for you. I assume if you compete, you compete to win, so you should do what you will be comfortable with. Personally if I were to compete, I would try it both ways, but I don't think you will be disappointed.