Home Depot 2x4. A kiln dried 2x4x8 weighs in on the lighter end at around 9 lbs while the pressure treated 24 weighs in closer to the 17 lb range. The Burrill Fir I think is a White Fir or a Hem Fir and seems lighter than the Doug Fir.
Most locations had a variation of at least 10 from driest board to wettest board. For example some stores may make up. 2x4 Nominal Size TxW in 2 x 4 Tint Brown Wood Species SprucePineFir.
Home Depot lumber sucks.
A kiln dried 2x4x8 weighs in on the lighter end at around 9 lbs while the pressure treated 24 weighs in closer to the 17 lb range. Wasted over 1 hour of my time. 30 times 24000 is 72000. Teak American Cherry Oak.