![]() ![]() I then use the velocity reading for those two shots to get a better calibration on the powder burn rate in QL. Once I find the charge weight that predicts the right exit time, I then go to the range and start low by about 2-3% for a couple of shots (runs a few foulers through first to get the barrel settled down!). What I usually do is to calculate the load in QL using as much information as I can get, most importantly the actual case volume in grains H2O and the actual seating depth that you will be using. If you think about the fact that powder burn rates can vary more then 5% between lots, then a 2% by weight charge difference from a computer prediction is actually pretty impressive. However, there have been some powders that were spot on.
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