I’ve been reading all I can find about the affects of altitude and pressure on ballistics. I’ve got a hypothetical question. I live at 4550 ft above sea level. It’s 60 degrees and sunny at my local range, my average chronograph reading is 3050 fps. I jump in my truck and head to my favorite spot to practice a few long range shots. I’m now 4000 ft higher at 8550 ft above sea level. The temp is still 60 degrees and sunny. Will my average speed still be 3050 fps? Does the lower barometric pressure have such an affect that my average speed will increase? I understand the bullet will drop less because of the pressure decrease. Given the same temperature, the muzzle velocity at sea level would be the same as 10,000 ft… right? Are changes in muzzle velocity caused mostly by the powders sensitivity to temperature changes?