You can't do any better than this scale.
Let me tell you a story. About a month ago I was reloading a bunch of processed (primer pocket swaged) milsurp .30-06 brass on my Dillon 550. After I had loaded about 75-80 rounds, much to my delight, I noticed that the decapping pin was missing. Now I was staring at pulling down all of the loaded rounds (I do have a collet puller). Instead I got a spare decapping pin out and weighed it on my 8 year old Pact scale. It weighed 7 grains. I then rapidly weighed each of the loaded rounds and naturally somewhere near the bottom of the pile was one that was around 7-8 grains heavy. I put it in my kinetic puller and sure enough the decapping pin came out with the bullet and powder. As it turned out, one particular brand of brass I was loading (think it was PMC) had a tight flash hole, and guess what? it happened again. This time the pile of loaded rounds was smaller and the Pact narrowed it down to 2 rounds, the second of which I hammered out had the decapping pin in it.
Of course you could do this with a beam balance, but what time are we talking here? The few times I've run my powder measure dry on my SL900, the Pact has come to the rescue (although with shotgun shells you will have a larger group of "possibles"). It will handle the weight of loaded rounds immediately without playing with the weights, you don't have to wait on it stop or begin equal swing, and if you're concerned about calibration, check it against your old dust collector over on the corner of your loading bench. Yeah, it's sensitive and will dance around in the wind, find a place for it or baby it for the minute or minute and a half you're using it. Occasionally people have even bought a Pact with a troublesome load cell in it. And I have seen times when fluorescent lighting seemed to be bothering it, but these times are rare. I still have my old Webster SR-1 from the '60s sitting on the bench that I use to check calibration, but my PACT hasn't needed it yet. I don't work for these people, I don't even live in Texas, but I know a good product when I have one. Get the $130 model and a cheap beam balance for backup. There's probably a dozen beam balances on Ebay right now. Good luck.