I know a lot of people who use the barrel & do the "plunk" test. However,, a $10-$15 tool will make it much easier & you don't have to disassemble or re-assemble a gun all the time. Plus,, I've seen a few times where a case passed the plunk test,, yet gave feeding issues. The proper use of a case gauge is highly recommended. (And yes,, I see you plan on getting one.)
Also, as mentioned above,, cleaning cases before loading is a good thing. As is lubing some & using lube even with carbide dies. It does make things go smoother.
Personally, due to the volume I shoot, I use a Dillon 650 progressive with the case feed. I normally pour brass in the feed hopper, give a little squirt of Dillon case lube, and go to work. Things go very smoothly for me. (PS; My dies in my Dillon press are RCBS.)