I was going off what members on here said. They have the brass insert GT's that weigh with point at 430 grains. Was what I was also told by Dan Miller when I bought them. But mine when I first got the scale they weight in 30 grains less. Now yours are 8 grains heavier, but you have the 4" vanes, makes sense to me, but neither of us have the 430 grain arrows that people said we have. What weight where you told your GT weighed when you bought them? Again, don't none of you take this as a grip about GT arrows, I like them, I like shooting them as much as I like knowing what I am using also!! LOL!!