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Range Report having trouble with jbm, help!!!

huntinggamo

Sergeant
Full Member
Minuteman
Oct 14, 2010
183
5
36
Northern Colorado, United States
Shooting 260 remington, having trouble getting accurate data that matches my real world data. Atmospherics were taken using a kestrel NV 4500, speed data was taken using a magnetospeed chronograph. bullet is 6.5 142 matchking

sight in data
baro: 29.09 alt:5924 DA: 8247 temp 70.9f hum: 49.9, 100yd zero, 24rd avg 2863

field report 1
baro: 29.30 alt:9075 DA:12695 temp:81.4f hum: 27.9 confirmed dope on paper at 1050yds 27 MOA

Field report 2
Baro:29.64 Alt:5320 DA:8047 Temp:79f Hum:36.7 confirmed dope on paper at 1117yds 30.25 MOA

i cant get JBM to match my real world paper results without dropping my velocities down significantly, or making some other kind of major change. am i doing somthing wrong here?