I am trying to figure out if my 257 Weatherby load is compressed or not. I asked this question on another forum and havn't got a response yet. I loaded a 100gr barnes Tipped TSX bullet to 3.170 Coal ranging from 75.5 to 78.0gr and started to hear powder crunching at 77.5 and 78.0 grains of H-1000. Hodgdon list 78.0 as book max, but they are using a different bullet and a COAL of 3.20. I am just trying to figure out if this a compressed load or not. I went home and did some figuring and this is what I came up with..... Was this done correctly So, I got home and did a little calculating. I filled the case with water and it weighed 85.5 grains which is consistent with other findings. I then filled the case with water and inserted a bullet to my seating depth which should tell me my case capacity. The water left in the case after removing the bullet weighed 80.7 grains. So my case capacity after seating a bullet should be 94.4% of the original capacity. I then filled the case with H-1000 and it weighed 83.0 grains. Multiplying that by .944 gives me 78.35. Am I correct in thinking that this is my true case capacity after bullet seating and a load at 78.0, although it crunches powder, is not really a compressed load????