If you are using the 4006 you should be seeing slightly lower velocities from the factory 180gr ammo, something like 880-940fps range. If you got the 1030 out of the Aquila 180 it was a hot batch for sure. Watch loading longer as the main problem is feeding inside the mag tube, I usually see binding with flat nose bullets around 1.135". You might also see chambering problems with lead jamming against the rifling too soon loaded long. I only load 40 to make major power factor which is 920fps with a 180gr, I wouldn't push it much past 950 out of a 4" gun myself.