Hit registration is horrible on snipers in Firestorm almost specifically. I watch sniper rounds go through heads and bodies, blood splatter and all and absolutely nothing. And it's not specific to loadout or sniper rifle, it does the same with the M2010 ESR with x6, x8 and x10 scope as well as the SV-98 with x6 or x8 scope. It happens with a few other big maps as well but almost every game of firestorm has had this issue. I almost refuse to play that map now because of it.
I have a full 1gb internet connection, hard wired in and my port forwarding is all correct. And yes, I have been a IT professional for 20+ years. There have been mentions of net coding or how firestorm is with clipping and other things, but no guaranteed answer and it is not completely fixed either. It doesn't matter which bullet in the magazine either. I have fired several rounds and have watched it happen too many times and as soon as I see this, I just quit the match.