While I'm not the Ordinance Officer, I really doubt if anyone's going to break down your loads and weigh the bullets. There tends to be some variation in the weight of cast bullets anyway, depending on the exact alloy used to cast them. I use a cast bullet from a Lee mold, supposed to be 405 gr, I haven't weighed them to see exactly what they weigh. It's a flat base bullet, and I use a 3/8 fiber wad over 55gr Goex 2F for my GAF load.