I weigh them. I used to get real nice groups then all the sudden get this flyer 2" away. So I figure its one step to get rid of the flyer. Its a never ending battle. Next, you will be looking a primer pocket uniformers, then Case concentricty gauges and then be making shoulder measurements. It seems there is no way to reach perfection.

But hey if you wanted to reload to match factory loads. I wouldn't wiegh.

Hope it helps.