I wasn't aware that new brass was availiable for the 5.7X28. Is this once fired brass ?
If it is, be aware that the shoulder of such brass may well be blown out quite abit. When I compared the fired brass from my FN pistol, I was really surprised by how much the shoulder had moved forward. On the order of .25 inches or more.
I have not reloaded the round for a rifle. In my handgun, using new brass from factory ammo, I was able to get some really accurate loads. Without going anywhere near maximum pressures using Ramshot Data, and Sierra 40 gr. Hornet bullets, I got far more penetration than either of the FN factory loads, but not as much explosive effect. E