Thread: Altitude and ballistics

ok, dumb question but I'll ask anyway - how much does altitude (temp & pressure) effect bullet ballistic performance & drop ?
Most of my load dev done at ~ 300 ft above SL @ 17C +/- 5, most hunting at or near bush line say 2800 ft alt 5C +/- 5.
Assuming good weather ( atmospheric pressure at 1010 - 1020 hPa at SL) after correcting atm pressure for altitude and assumed temps above it looks like there's bugga all difference ? Yeah or nah ?