I was loading a batch of 230 gr 45acp this afternoon on my Dillon 550b. After about 20 rounds I looked over at my scales and lo and behold there was enough powder for about one round. I thought, that only means one thing, when I was performing random powder checks (about 1 out of every 10-15), I forgot to dump the powder back in the case after weighing it. That also means there is a squib in the batch somewhere. Short of breaking them all down to find it, what would you suggest doing.
I did that once.
Once was enough.
Since, at the time, I loaded (on my progressive) in batches of 50, i only had to break down 35 rounds to find the 12 I had loaded under an empty auto-drop powder measure.
Lesson learned.
No, there is pretty much no way to be sure.
Some people might suggest weighing all the completed rounds to find the one that is lighter than the rest by the amount of the (intended) powder charge. This is only
practical if your brass, primer and bullet do not vary in weight.
Or, you could shoot them one at a time. Just be sure to bring tools to remove the stuck bullet.
Kinetic bullet puller is only about $20. I had one for years before ever using it. Good investment.
RCBS's instructions say to whap it against concrete, but I use the end grain of a short 4x4 timber. I find the rebound helps. I hold the handle lightly (it is aluminum and if I grip it hard, it develops a bend eventually). I bring it down smartly on the wood and let it rebound freely. Two or three raps is usually all it takes.
It should only take you 10-15 minutes. You can probably re-use the powder. Probably the bullets, too, but since (especially if they are cast lead) they have been swaged a little by the seating/crimping process I would not expect them to be super-accurate. Measure their diameter carefully. Also, test them for cycling setback.
Good luck.