I'm wondering how much velocity is lost in a compensated barrel vs a standard barrel. I'm looking to get 1300 fps with a 200gr bullet using published load data and not going more then .2 grains above their max 10mm auto data. I don't see any data that would let me do this with a standard glock 20 barrel so I'm thinking after market 6 but it seems kinda crazy to go for that and not get the ported/compensated. Have any of you chronographed your loads to see how close they are to your loading data. It would be great to know just in general what data you used, what barrel you used, and what your actual velocities were. This is for all barrels even stock just to know how close the data is to real life.