300 rounds of .40 S&W after I ran them through the case gauge:
I’m probably not quite as obsessive as you might think from the layout of the rounds on my desk.
I use a case gauge that holds 20 rounds:
This speeds up the gauge testing and allows me to count the rounds easily by organizing them into groups of 20 before I put them loose into an ammo can.
Not a reloader here: When you have the 20 rounds in the holder, can you tell by sight or by feel which ones have the bullet seated too deep or too loosely?
No definitive test for too deep. But over length is easy with my Midway and L.E. Wilson case gauges. The Double Alpha gauge doesn’t give me a strong clue. But I have never had any issues with the seating depth once I had my seating die set up. Those type failures just don’t happen. It’s the brass with bulges which is the big issue with pistol rounds.
I have a Factory Crimp die which comes very close. In several thousand reloads, from my own fired brass, I did not find a single reject. When reloaded once fired brass from other guns I get about one reject for every 250 rounds (from about a 3000 round sample). But that reject, while sticky in the chamber of my gun, works fine. I’m considering dropping the case gauge check.
If I run the brass through a Redding G-RX Carbide Push Thru Base Sizing Die then I have no rejects (out of a many thousands sample size). But that involves setting up the press for the resizing and then setting it back up for reloading as well as the resizing operation.
I bought a case gauge a while ago after running into factory ammo that was out of spec. Blazer Brass, if I remember right (9 mm). A substantial percentage of that box was slightly oversize, or possibly overlong.