Doubless,
Thank you and I accept your apology.
There seems to be two chains of thought going on here.
As to the original post. Weighing them will tell him nothing. There is no way to know what powder was used. So that in itself is enough to say "don't shoot" them. Even if the all weigh exactly the same, the same as what??
Just don't shoot other peoples reloads unless you know for sure. I have lots of guys ask me to reload for them (Usually big rifle calibers) I always tell them no. Why? Yes, I know how to and do it well but what about that one in a million chance something goes wrong? I do not want to be responsible for damage to their expensive rifle let alone personal injury. No they would not sue me but I would feel terrible for ever.
If a reloader (lets say a Bench Rest kind of shooter) starts with all top quality components ( How about Lapua) and weighs each piece of brass and each bullet and culls out ones that weigh exactly the same on a high quality scale. Then uses a high quality match primer ( I doubt they vary much) Then weighs every powder charge and trickles them to perfection.
In theory, then yes they should all weigh the same within the variance +/- of the scale he or she is using.
However there would be no reason to weigh the finished round as the rounds were assembled with known items and done to perfection in the first place.
I personally load my rifle rounds slower and more carefully than my pistol rounds. I use a load block and manually drop each powder charge with a RCBS powder measure(an older model made of heavier metal than their new ones. It is about as perfect as a measure can get. I check drops every 10 or so, I use the same headstamp brass from the same lot all trimmed to length. No I do not weigh them or calculated internal water volume. I use Nosler, or Sierra bullets.
Now if an general reloader is loading say handgun ammo for a day at the range and uses mixed brass and lead projectiles, even though the powder is weighed perfectly and the primers are the same, there can be a large variance in just the bullet (maybe the lead or certainly the lube weight. Mixed brass will all weigh differently.
That combined with the variance in a scale can give very different total weight to the whole cartridge.
So I hope this clears things up and I am moving on.
